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: 12937 Search : far
lepton
  لپتون   
lepton (#)

Fr.: lepton   

An → elementary particle that does not participate in the → strong interaction. The Lepton family includes → electrons, → muons, tau leptons, → neutrinos and their → antiparticles. The lepton is a → fermion.

From Gk, lepto-, combining form of leptos "small, slight" + -on a suffix used in the names of subatomic particles (gluon; meson; neutron), quanta (photon; graviton), and other minimal entities or components.

lepton degeneracy
  واگنی ِ لپتون   
vâgeni-ye lepton

Fr.: dégénérescence des leptons   

Postulate that the magnitude of the lepton number density is comparable to or larger than the thermal radiation photon number density, so relaxation to equilibrium produces a degenerate sea of neutrinos. Degenerate neutrinos would suppress the number of neutrons relative to protons in the very early Universe; degenerate antineutrinos would suppress the number of protons relative to neutrons. Either case would affect BBNS (Peebles, P. et al., 2009, Finding the Big Bang, Cambridge: UK, Cambridge Univ. Press).

lepton; → degeneracy.

lepton era
  دوران ِ لپتونی   
dowrân-e leptoni (#)

Fr.: ère leptonique   

The era following the hadronic era, when the Universe consisted mainly of leptons and photons. It began when the temperature dropped below 1012 degrees kelvin some 10-4 seconds after the Big Bang, and it lasted until the temperature fell below 1010 degrees kelvin, at an era of about 1 second.

lepton; → era.

lepton number
  عدد ِ لپتونی   
adad-e leptoni (#)

Fr.: nombre leptonique   

In particle physics, a quantum number attributed to elementary particles which is conserved in nuclear reactions. It is +1 for a lepton, -1 for an antilepton and 0 for other particles.

lepton; → number.

Lepus
  خرگوش   
Xarguš (#)

Fr.: Lièvre   

The Hare. A small → constellation in the southern hemisphere at about 6h right ascension, 20° south declination. Abbreviation: Lep; genitive: Leporis.

L. lepus "hare."

Xarguš "rabbit, hare," literally "ass-ear," Mid.Pers. xargôš, from xar "donkey, ass" (Mid.Pers. xar "donkey;" Av. xara- "donkey;" cf. Skt. khára- "donkey, mule") + guš, → ear.

Lesath (Upsilon Scorpii)
  لسعه   
Las'é

Fr.: Lesath   

A bright blue star of → apparent visual magnitudeV = 2.70, that with → Shaula (Lambda Scorpii) makes up the Scorpion's stinger. Among its other designations: HR 6508 and HIP 85696. Lesath is 580 → light-years away. Lesath and Shaula appear very close on the sky (less than a degree apart), but they are not physically related. Lesath is a → subgiant of → spectral type B2 IV with a → luminosity of about 7,380 Msun. It has a radius of about 6 Rsun, and a → surface temperature of about 22,000 K.

Lesath, from Ar. al-Las'ah (اللسعه) "the sting."

letter
  ۱) وات؛ ۲) نامه   
1) vât (#); 2) nâmé (#)

Fr.: lettre   

1) A symbol or character representing a sound of which words are formed used in writing and printing a language.
2) A written or printed communication addressed to a person or organization.

M.E., from O.Fr. letre "character, letter; missive," from L. littera "letter of the alphabet," litterae (plural) "epistle, literature"

1) Vât "letter, word," from vat- "to speak, say;" cf. (Kurd.) wittin "to speak, say," → article, (Nâyin) vâte, (Qohrud) vâta, (Sangesar) -vât-/vân, (Zazaki) vâtiš, (Awromani) wâtay/wâc-, (Farizand) -vât/-vaj, (Gaz) vâ-/vât, related to Pers. vâžé "word;" Mid.Pers. vâc, vâcak "word, speech;" âva "voice, sound," âvâz "voice, sound, song," bâng "voice, sound, clamour" (Mid.Pers. vâng); Av. vacah- "word," vaocanghê "to decalre" (by means of speech), from vac- "to speak, say;" cf. Skt. vakti "speaks, says," vacas- "word;" Gk. epos "word;" L. vox "voice;" PIE base *wek- "to speak."
2) Nâmé, → book.

level
  تراز   
tarâz (#)

Fr.: niveau   

A position with respect to a given or specified base. → energy level.

From O.Fr. livel, from L. libella "a balance, level," diminutive of libra "balance, scale."

Tarâz "level; a level," from tarâzu "balance, scales," Mid.Pers. tarâzên-, taraênidan "to weigh," Proto-Iranian *tarāz-, from *tarā- "balance, scale" ( cf. Skt. tulā- "scales, balance, weight," from tul- "to weigh, make equal in weight, equal," tolayati "weighs, balances," L. tollere "to raise," Gk. talanton "balance, weight," Atlas "the Bearer" of Heaven," Lith. tiltas "bridge;" PIE base telə- "to lift, weigh") + Av. az- "to convey, conduct, drive," azaiti drives" (cf. Skt. aj- "to dive, sling," ájati "drives," ajirá- "agile, quick," Gk. agein "to lead, guide, drive, carry off," L. agere "to do, set in motion, drive," from PIE root *ag- "to drive, move," → act).

level of significance
  تراز ِ نشاناری   
tarâz-e nešânâri

Fr.: niveau de significativité   

Same as → significance level.

level; → significance.

lever
  اهرم   
ahrom (#)

Fr.: levier   

A rigid bar that pivots about a point and is used to move or lift a load at one end by applying force to the other end. → lever arm.

M.E. levere, levour; O.Fr. levier "a lifter, a lever," agent noun from lever "to raise," from L. levare "to raise," from levis "light" in weight.

Ahrom, of unknown etymology.

lever arm
  بازوی ِ اهرم   
bâzu-ye ahrom (#)

Fr.: bras de levier   

The distance between the point of application of a → force and the → axis around which the object could → rotate.

lever; → arm.

levitate
  ۱) بالا کردن؛ ۲) بالا شدن   
1) bâlâ kardan; 2) bâlâ šodan

Fr.: 1) se soulever; 2) soulever   

1) To rise or float in the air, especially by means of supposed magical powers.
2) To cause to rise or float in the air.

From L. levitas "lightness," from levis "light."

Bâlâ kardan, literally "to raise, uplift," from bâlâ "high, up," → high, + kardan "to do, perform, make," → effect; bâlâ šodan, from bâlâ + šodan "to go, to pass, to become," → set.

levitation
  ۱) بالا‌کرد؛ ۲) بالا‌شد   
1) bâlâ-kard; 2) bâlâ-šod

Fr.: lévitation   

1) The action of rising or causing something to rise and float in the air, typically by means of supposed magical powers.
2) → radiative levitation.

levitate; → -tion.

levo-, lev-
  چپ-   
cap- (#)

Fr.: levo-   

A combining form meaning "left" and "counterclockwise," used in the formation of compound words, such as → levorotation, levocardia, levoglucose, etc. The variant lev- occurs before vowels. Compare → dextro-.

From L. laevo-, from laevus, cf. Gk. laios, Russ. levyj, + epenthetic vowel -o-.

Cap-, from cap "left," of unknown etymology.

levorotation
  چپ‌چرخش   
capcarxeš

Fr.: lévorotation   

The counterclockwise rotation of the → plane of polarization of light (as observed when looking straight through the incoming light) by certain substances.

Adj. related to → levorotation.

levorotatory
  چپ‌چرخ   
capcarx

Fr.: lévogyre   

Relating to an → optically active substance that brings about → levorotation.

Adj. related to → levorotation.

lexicography
  واژه‌نگاری   
vâženegâri

Fr.: lexicographie   

A branch of → linguistics that deals with the principle and methods of writing dictionaries.

lexicology; → -graphy.

lexicology
  واژه‌شناسی   
vâžešnâsi (#)

Fr.: lexicologie   

A branch of → linguistics that studies the formation, meaning, and use of words and their idiomatic combinations. In contrast to → terminology, lexicology is based on words and does not conceive of meaning unless it is related to the word.

From lexic, from Gk. lexicon, noun use of lexikos "pertaining to words," from lexis "word; speech" (+ -ikos, → -ics), from legein "to say, speak, recount," + -o-, + → -logy.

Vâžešnâsi, from vâžé, → word, + -šenâsi, → -logy.

Leyden jar
  بطری ِ لیده   
botri-ye Leydé

Fr.: bouteille de Leyde   

An early form of → capacitors which is a glass jar coated inside and outside about half way up the side with metal foil. A chain connects the inner coating to a rod which usually terminates in a small brass knob. The jar is charged by connecting the knob, that is the inner metal coating, to a charged body, meanwhile grounding the outer coating. Same as Leiden jar

Named after Leyden (Leiden) the city where it was invented by the Dutch scientist Pieter van Musschenbroek in 1745, independently from the German Ewald Georg von Kleist; jar a usually "cylindrical vessel," from M.Fr. jarre, from Provençal jarra, from Ar. jarrah.

Botri, → bottle.

Li I line
  خط ِ Li I   
xatt-e Li I

Fr.: raie Li I   

lithium I line.

lithium; I for → neutral atom; → line.

<< < -es -iv -ti 217 A s abe abs abs acc acc Ach act act ADa adi adv aff age Alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg arm art ass ast ast ast atm ato att aur aut axi B-t Bai Bal bar bar Be bed Bes BHB bif bim bin Bio bis bla ble blu bod Bol bor bou bra Bre bro Bul cag cal can Can car Car Cas cat CCD cel cen Cet cha cha che che chr cir cir cit cla clo clo clu 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 coo cor cor cor cos cos cos cou cou cra cri cro cry cul cur cyc D r dar dat day dea dec dec dec def def deg del den dep des det deu dex dif dif dif dim dip dir dis dis dis dis dis div dom dos dou dri Dum dus dyn dyn ear eas ecl Edd eff Ein eje ele ele ele ele eli emb emi Enc ene ens eph epo equ equ eru eth Eul eve evo exc exc exi exo exp exp ext ext fab fai Fan Fea fem fer fie fil fir fis fla flo flu foc for for Fou fra fre fre fro fun G r Gal gal gam gas Gau gel gen geo geo geo Gho gla goa gra gra gra gra gre Gre gro gyr had hal har har HD Hea Hel hel Her her hid hig Hip hom hor hot Hub Hub hun hyd hyd hyg Hyp ice ide ima imm imp imp inc ind ind ine inf inf inf ini ins ins int int int int int int int int int inv ion iro ise iso iso Jab jet Jov Jur Kel Kep kil kit Kui Lag lam lan Lar Lat law lea lem lep Li- lig lim lin lin lio lit loc lod lon Lor low Lum lun Lup Lyn mac mag mag mag mag mag mai man mar mas mas mat Max mea mec mel mer mes met met met mic mid mil Min mir mix mod mol mom Moo mor mov mul mur nab nar nat neb neg nes neu New New nig nod non non non Nor nua nuc nul Nun OBC obl obs occ oct off Ohm on- ope opp opt opt orb orb org Ori ort Ost out ove p m Pal par par par par Pas pat Peg Peo per per per per per pha Phe pho pho pho phy pin pla pla pla pla pla plu poi pol pol Pol pol pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro pro pro pse pul Pup Qua qua qua qua que rac rad rad rad rad rad rad ran rap 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 Sac sal sat sca sca Sch sci Scu sec sec Sed sel sem sen Ser Sey Sha she sho sid sig sim sin sip ske sli smo soc sol sol sol sol sol sou spa spa spe spe spe spe Spi spi spo squ sta sta sta sta Ste ste ste sto str str str sub sub sub sun sup sup sup sup sur sus sym syn T-s tar Tei tem ter tes the the the the thi thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur Tyc Typ ult unb und uni uni unr upp Urs vac van Var veg Ven ver vib vio vir vis vol VY war wat wav WC8 Web wes whi win WN1 wob wri X-r yoc zen Zhe > >>