An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13176 Search : in
meridian instrument
  سازال ِ نیمروزانی   
sâzâl-e nimruzâni

Fr.: instrument méridien   

An instrument designed to observe objects when they cross the meridian.

meridian; → observation.

meridian observation
  نپاهش ِ نیمروزانی   
nepâheš-e nimruzâni

Fr.: observation au méridien   

The observation of a star when it crosses an observer's meridian.

meridian; → observation.

meridian passage
  گذر ِ نیمروزانی   
gozar-e nimruzâni

Fr.: passage au méridien   

The moment when a celestial object crosses an observer's meridian. Same as meridian transit.

meridian; → passage.

meridional
  نیمروزانی   
nimruzâni

Fr.: méridien   

Of, pertaining to, or resembling a meridian.

meridian + → -al.

From nimruzân, → meridian, + -i adj. suffix.

meridional circulation
  پرهونش ِ نیمروزانی   
parhuneš-e nimruzâni

Fr.: circulation méridien   

The mass motion of material within a → rotating star generated by the star's departure from spherical symmetry. For a rotating star in which → centrifugal forces are not negligible, → radiative equilibrium and → hydrostatic equilibrium cannot be satisfied. In this condition energy transfer is accomplished by means of the physical motion of material. According to → von Zeipel theorem, the heating on an → equipotential surface is generally higher in the polar direction than in the equatorial direction, which drives a large scale circulation current rising at the pole and descending at the equator. As a consequence, → mixing of material takes place in the stellar interior; see also → Eddington-Sweet time scale. The meridional circulation plays an important role in the evolution of → massive stars. The circulation current was first suggested by Arthur S. Eddington in 1926 (The Internal Constitution of the Stars, Dover Pub. Inc., New York) and subsequently quantified by P. A. Sweet (1950, MNRAS 110, 548).

meridional; → circulation.

meridional flow
  تچان ِ نیمروزانی   
tacân-e nimruzâni

Fr.: courant méridien   

Meteo.: A flow between the poles, or between the equator and the poles. A positive value indicates flow away from the equator; a negative value, flow toward the equator.

meridional; → flow.

meridional magnetic field
  میدان ِ مغناتیسی ِ نیمروزانی   
meydân-e meqnâtisi-ye nimruzâni

Fr.: champ magnétiquue méridien   

In the → solar dynamo model, a magnetic field that points from the north to south or south to north.

meridional; → magnetic; → field.

Merope
  مروپه   
Meropé (#)

Fr.: Mérope   

One of the stars in the Pleiades with a visual magnitude 4.17. It is a giant of spectral type B6 lying at a distance of about 1400 light-years.

Merope was one of the seven Pleiades, daughters of the Titan Atlas.

Mersenne prime
  نخست ِ مرسن   
naxost-e Mersenne

Fr.: nombre de Mersenne premier   

A → prime number of the form 2p - 1, where p is a prime. As of February 2013, 48 Mersenne primes are known. The largest known prime number is 257,885,161 - 1. Each prime gives rise to an even → perfect number.

Marin Mersenne (1588-1648), French theologian, philosopher, mathematician and music theorist; → prime.

Mesarthim (γ Arietis)
  مسارتیم   
Mesârtim

Fr.: Mésarthim   

A star of visual magnitude 4.8 lying 204 light-years away in the constellation → Aries. It is in fact a triple star system.

The origin of Mesarthim (or Mesartim) is a matter of controversy. Some scholars have related it to the Ar. methartim (مثرطم) "very fat (animal)," but the connection is not obvious although the words are apparently similar. The original Ar. name was Šaratayn (الشرطین) "the two marks" denoting the current β and γ stars in Aries. It was also the name of the lunar mansion of which these two stars were members. Johann Bayer (1572-1625) erroneously related Šaratayn to the Hebrew Sartai, a current term in the astrological literature of his time. Subsequently, others figured that Sartai was related to Hebrew Mesartim "servants." The Latin transliteration and alteration Mesarthim found much success in establishing itself as the proper name for star γ Arietis.

mesh
  بانچه   
bâncé

Fr.: maille, maillage   

1) One of the open spaces between the cords or ropes of a net.
2) Any knit, woven, or knotted fabric of open texture.
3) An interwoven or intertwined structure; network.
4) Electricity: A set of branches that forms a closed path in a network so that removal of a branch results in an open path. (Dictionary.com).

M.E. mesche "open space in a net," apparently from O.E. max "net," earlier mæscre (cf. Dan. maske, Sw. maska, M.Du. maessce, Du. maas "mesh," O.H.G. masca, Ger. Masche "mesh").

Bâncé "aperture, opening, window" in (Kermânšâhi) Kurd., ultimately from Proto-Ir. *banaka-, from *baH- "to shine," cf. Av. bāmya- "light, bright;" Pers. bâm "morning, dawn; splendor, light," Ossetic bon "day," probably related to bezel "opening, aperture," in several dialects of the Fârs province (Lâr, Gerâš, Xonj, Fišvar), → morning.

meso-
  مسو-   
meso-

Fr.: meso-   

A combining form meaning "middle," used in the formation of compound words; e.g. → meson; → mesosphere.

From Gk. mesos "middle, in the middle;" akin to L. medius, Pers. miyân, → middle; → medium.

Meso-, loan from Gk.

meson
  مسون   
meson

Fr.: méson   

A nuclear particle with a mass intermediate between that of a proton and an electron, which is believed to be responsible for the strong nuclear force. In contrast to the case of baryons or leptons, meson number is not conserved: like photons, mesons can be created or destroyed in arbitrary numbers. Their charge can be positive, negative, or zero.

From mes-, meso-, from Gk. mesos "middle," akin to L. medius, Pers. miyân, → medium, → middle, + -on a suffix used in the names of subatomic particles.

mesosiderite
  مسوسیدریت   
mesosiderit

Fr.: mesosidérite   

A class of → meteorites that is → brecciatedstony-iron with nearly equal amounts of → metal and → silicates.

meso-; → siderite.

mesosphere
  مسوسپهر   
mesosepehr

Fr.: mésosphère   

The layer of the atmosphere located between the → stratosphere and the → ionosphere, where temperature drops rapidly with increasing height. It extends between 17 to 80 kilometers above the Earth's surface.

meso-; → sphere.

message
  پیام   
payâm (#)

Fr.: message   

1) General: A piece of information (written, spoken, or by signals).
2) Computer science: A defined amount of information, coded or not, between machines or machines and men. → information theory.

M.E., from O.Fr. message "message, news, embassy," from M.L. missaticum, from L. missus "a sending away, dispatching," from mittere "to send," → mission.

Payâm, variants payqâm, peyqâm, Mid.Pers. paygâm, ultimately from *patigam-, literally "arriving, newcomer," from *pati- "to, toward, at, in," → ad hoc, + *gam- "to come," → heliosheath.

messenger
  پیامبر   
payâmbar (#)

Fr.: messager   

One who brings → messages.

From M.E. messengere, messingere, messangere, from O.Fr. messanger, a variant of messagier, from → message + → -er.

Payâmbar "messenger," from payâm, → message, + bar "carrier," from bordan "carry," → vector.

MESSENGER spacecraft
  فضاناو ِ مسنجر   
fazânâv-e MESSENGER

Fr.: sonde MESSENGER   

A NASA robotic spacecraft that orbited the planet → Mercury for more than four years, between 2011 and 2015. Among its accomplishments, the mission determined Mercury's surface composition, revealed its geological history, discovered details about its internal magnetic field, and verified its polar deposits are dominantly water-ice. → Mercury's tail.

Messenger, short for "MErcury Surface, Space ENvironment, GEochemistry, and Ranging", a reference to the → messenger god Mercury from Roman mythology; → spacecraft.

Messier catalog
  کاتالوگ ِ مسیه   
kâtâlog-e Messier

Fr.: catalogue de Messier   

A catalog of more than 100 nebulous-appearing astronomical objects, initially established to avoid confusion with comets. These objects are now well known to be among the brightest and most striking gaseous nebulae, star clusters, and galaxies. The designations of the catalog are still used in identification; e.g. M1 is the Crab Nebula (in Taurus).

In honor of the French astronomer Charles Messier (1730-1817), who compiled the list between 1760 and 1784 in order to avoid confusion with comets; → catalog.

Messier object
  بر‌آخت ِ مسیه   
barâxt-e Messier

Fr.: objet de Messier   

Any of the nebulous-looking → astronomical objects listed in the → Messier catalog.

Messier catalog; → object.

<< < -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 > >>