An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13176 Search : in
last scattering
  واپسین پراکنش   
vâpasin parâkaneš

Fr.: dernière diffusion   

The epoch in the early evolution of the Universe when matter and photons decoupled. Once atoms formed, light and matter stopped constantly interacting with one another, and photons were able to travel freely. As a result, the Universe became transparent. Light from this period is observed today as the → cosmic microwave background radiation. Same as → decoupling era and → recombination era.

last; → scattering.

last scattering surface
  رویه‌ی ِ واپسین پراکنش   
ruye-ye vâpasin parâkaneš

Fr.: surface de dernière diffusion   

The set of locations in space corresponding to the → last scattering epoch in the early Universe. It is a spherical surface around the present-day observer from which the → cosmic microwave background radiation appears to emanate.

last; → scattering; → surface.

last-born
  دمازا   
demâzâ

Fr.: dernier né   

Last in order of birth; youngest.

last; → born.

Demâzâ, from Lori, Laki demâzâ, from demâ "last, end, back," related to dom, → tail, + contraction of zâd, → born.

lasting
  پاینده   
pâyande

Fr.: durable   

Continuing or remaining for a long time; enduring.

last; → -ing.

late
  ۱) دیر؛ ۲) دیران   
1) dir (#); 2) dirân

Fr.: tardif; tard; avancé   

1) Happening or arriving after an expected or arranged time; not on time, beyond usual time.
2) Belonging to an advanced stage or period in the development of something. → Late Heavy Bombardment, → late helium flash, → late thermal pulse, → late-type galaxy, → late-type star.

M.E., from O.E. læt "slow, late;" cf. Ger. lass "slothful;" O.N. latr, Goth. lats "slow, lazy;" L. lassus "tired, faint;" Gk. ledein "to be weary."

Dir "late; tardily, slowly; a long while; old, antique," from Mid.Pers. dêr, variants dagr, drâz "long" (Mod.Pers. derâz "long," variant Laki, Kurdi derež); O.Pers. darga- "long;" Av. darəga-, darəγa- "long," drājištəm "longest;" cf. Skt. dirghá- "long (in space and time);" L. longus "long;" Gk. dolikhos "elongated;" O.H.G., Ger. lang; Goth. laggs "long;" PIE base *dlonghos- "long."
Dirân, adjective, variant of dir, as above.

Late Heavy Bombardment (LHB)
  بمباران ِ سنگین ِ دیران   
bombârân-e sangin-e dirân

Fr.: Grand Bombardement Tardif   

A cataclysmic event in the history of the → solar system, estimated to have occurred 3.9 billion years ago (about 600 million years after the formation of the → terrestrial planets) during which → asteroid and → comet impacts with Earth were some 20,000 times more frequent than today. It is estimated that during this period the terrestrial planets were bombarded with an object 1 km in size every 20 years. This hypothetical event lasted 50 to 150 million years. Several explanations have been put forward, among which the occurrence of an instability in the outer solar system which caused → orbital migration of small bodies from the → Kuiper belt inward.

late, with respect to the formation time of the planets; → heavy; bombardment, noun from bombard, from Fr. bombarder, from bombarde "mortar, catapult" from bombe, from It. bomba, probably from L. bombus "a booming sound," from Gk. bombos "deep and hollow sound."

late helium flash
  درخش ِ هلیوم ِ دیران   
deraxš-e heliom-e dirân

Fr.: flash de helium tardif   

A → helium flash event that occurs during the → post-AGB phase. Some of the central stars of planetary nebulae (→ CSPN) experience a final → thermal pulse after having achieved a → white dwarf configuration and begun their descent along a → white dwarf cooling track of nearly constant radius. During such a pulse, most of the hydrogen remaining in the star at pulse onset is incorporated into the helium-burning convective shell and completely burned. Following the pulse, the star swells briefly to → red giant dimensions (Iben et al. 1983; ApJ 264, 605).

late; → helium; → flash.

late thermal pulse
  تپه‌ی ِ گرمای ِ دیران   
tape-ye garmâyi-ye dirân

Fr.: flash de l'hélium tardif   

In evolutionary models of → low-mass and → intermediate-mass stars, the occurrence of a → helium shell flash on the → horizontal branch of the → post-AGB track, while → hydrogen shell burning is still going on.

late; → thermal; → pulse.

late-type galaxy (LTG)
  کهکشان ِ گونه‌ی ِ فرجامین   
kahkešân-e gune-ye farjâmin

Fr.: galaxie de type tardif   

In the → Hubble classification, a galaxy on the left part of the → Hubble sequence. See also → early-type galaxy.

late; → type; → galaxy.

late-type star
  ستاره‌ی ِ گونه‌ی ِ فرجامین   
setâre-ye gune-ye farjâmin

Fr.: étoile de type tardif   

A star of → spectral type K, M, S, or C, with a surface temperature lower than that of the Sun. → early-type star. See also → spectral classification.

late; → type; → star.

latent
  نهان   
nahân (#)

Fr.: latent   

Present but not visible, apparent, or actualized; existing as potential (Dictionary.com). → latent heat.

From L. latentem (nominative latens), pr.p. of latere "to lie hidden."

Nahân "concealed, hid; clandestine;" Mid.Pers. nihân "secrecy, a secret place, a hiding place," nihânik "concealed;" Av. niδāti- "deposing, deposit."

latent heat
  گرمای ِ نهان   
garmâ-ye nahân (#)

Fr.: chaleur latente   

The amount of → thermal energy that is absorbed or released by a unit amount of a substance in the process of a phase change under conditions of constant pressure and temperature.

latent; → heat.

lateral
  بری، کناری، پهلویی   
bari, kenâri, pahluyi

Fr.: latéral   

Of or relating to the → side; situated at, proceeding from, or directed to a side (Dictionary.com).

M.E., from O.Fr. latéral and directly from L. lateralis "belonging to the side," from latus "the side, flank; lateral surface."

Kenâri, relating to kenâr, → side.

latitude
  وَرونا   
varunâ

Fr.: latitude   

The angle between a perpendicular at a location, and the → equatorial plane of the Earth. → longitude. See also:
astronomical latitude, → celestial latitude, → circle of latitude, → colatitude, → ecliptic latitude, → Galactic latitude, → geocentric latitude, → geodetic latitude, → geographic latitude, → high latitudes, → horse latitudes, → middle latitudes, → spherical latitude, → supergalactic latitude.

L. latitudo "breadth, width, size," from latus "wide," from PIE base *stela- "to spread" (cf. O.C.S. steljo "to spread out," Arm. lain "broad").

Varunâ, from var "breadth, side, breast," variant bar, Tabari vari "width," Mid.Pers. var "breast," Av. varah- "breast" (Sk. vara- "width, breadth") + -u a suffix forming adjectives; Av. vouru- "wide;" + -nâ a suffix of dimension.

lattice
  جاره   
jâré

Fr.: réseau   

1) A regular geometric arrangement of points in a plane or in space.
2) → Crystal lattice.
3) A structure in a nuclear reactor containing nuclear fuel and other materials arranged in a regular geometrical pattern.
4) Math.: A partially ordered set in which each two-element subset has both a greatest lower bound and a least upper bound.

From O.Fr. latiz "lattice," from late "lath, board, plank, batten" (Fr. latte); cf. O.H.G. latta "lath."

Jâré, from jarra "net; snare," Afghan jâli "reticulated garment," Tabari jarazin "grilled apparatus used in a watercourse to gather thatch and trash;" cf. Skt. jāla- "net, snare, lattice."

lattice energy
  کاروژ ِ جاره   
kâruž-e jâré

Fr.: énergie réticulaire   

The energy required to separate an ion from a → crystal to an infinite distance. In other words, the energy released when one → mole of a crystal is formed from gaseous ions.

lattice; → energy.

latus rectum
  تار ِ راست   
târ-e râst

Fr.: latus rectum   

The chord through a focus and perpendicular to then major axis of a conic section.

L. latus "side;" rectum "straight," → right.

Târ "thread, warp, string" (related to tur "net, fishing net, snare," tâl "thread" (Borujerdi dialect), tân "thread, warp of a web," from tanidan, tan- "to spin, twist, weave;" Mid.Pers. tanitan; Av. tan- "to stretch, extend;" cf. Skt. tan- "to stretch, extend;" tanoti "stretches," tántra- "warp; essence, main point;" Gk. teinein "to stretch, pull tight;" L. tendere "to stretch;" Lith. tiñklas "net, fishing net, snare," Latv. tikls "net;" PIE base *ten- "to stretch."

launch
  پرتاب کردن   
partâb kardan (#)

Fr.: lancer   

1) To throw or propel with force; hurl. → jet launching.
2) To set (a missile, spacecraft, etc) into motion

From M.E. launchen "to throw as a lance," O.Fr. lanchier, lancier "to hurl, throw, cast," from L.L. lanceare "wield a lance," from L. lancea "light spear, lance."

From partâb "a throw, an arrow that flies far," partâbidan "to throw," → ballistics.

lava
  گدازه   
godâzé (#)

Fr.: lave   

Molten → magma released from a volcanic vent or fissure.

Lava, from It. lava "torrent, stream," from L. lavare "to wash;" PIE base *lou- "to wash;" cf. Persian Lori, Kurdi, Malâyeri laf "flood," variants Tabari , [Mo'in, Dehxodâ] lur, lây "flood;" Gk. louein "to wash."

Godâzé noun from godâxtan "to melt," from Mid.Pers. vitâxtan, vitâcitan "to melt," from Av. vi-taxti- "flowing away, melting," from vi- "apart, away from, out" (O.Pers. viy- "apart, away;" cf. Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + tak- "to run, to flow," taciāp- "flowing water," tacinti (3pl.pers.act.) "to flow," tacar- "course," tacan "current, streaming;" Mod.Pers. tâz-, tâxtan "to run; to hasten; to assault," tâzi "swift (greyhound)," tak "running, rush;" Mid.Pers. tâz-, tâxtan "to flow, to cause to walk," tc- "to flow, to walk," tag "running, attack," tâzig "swift, fast;" Khotanese ttajs- "to flow, to walk;" cf. Skt. tak- "to rush, to hurry," takti "runs;" O.Ir. tech- "to flow;" Lith. teketi "to walk, to flow;" O.C.S. tešti "to walk, to hurry;" Tokharian B cake "river;" PIE base *tekw- "to run; to flow."

law
  قانون، ارته   
qânun (#), arté (#)

Fr.: loi   

1) A rule of conduct or procedure established by custom, agreement, or authority.
2) A code of principles based on morality, conscience, or nature.
3) Physics: A statement of a scientific fact or phenomenon that is invariable under given conditions; e.g. → Newton's law of gravitation, → second law of thermodynamics.
4) Math.: A general principle deduced from particular facts expressed by the statement that a particular phenomenon always occurs if certain conditions are present.

M.E., O.E. lagu, from O.N. *lagu, variant of lag "that which is laid down;" cf. Ger. liegen, E. lay, lie; PIE *legh- "To lie, lay;" compare with Hittite laggari "falls, lies," Gk. lekhesthai "to lie down," L. lectus "bed," O.Ir. lige "bed, tomb," Tokharian lake, leke "bed."

Qânun, from Ar., ultimately from Gk. kanon "rule."
Arté, from O.Pers. arta- "law, justice;" Av. arəta-, ərəta- "law, order," variant aša- "truth, cosmic order," aipi-ərəta- "firmly assigned," from root ar- "to fix;" cf. Skt. rtá- "truth, world order; oath;" Ossetci ard "oath;" Gk. arthon "limb, articulation," artus "a joint;" L. artus "a joint;" PIE base *ar- "to join, to fit together."

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>