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: 13116 Search : far
magnifying power
  توان ِ بزرگنمایی   
tavân-e bozorgnemâyi (#)

Fr.: grossissement   

The ratio between the focal lengths of the objective and ocular in a telescope.

Magnifying, verbal adj. of → magnify; → power.

magnitude
  برز، قدر   
borz, qadr (#)

Fr.: magnitude   

A measure of brightness in astronomy on a → logarithmic scale in which a difference of five magnitudes represents a difference of 100 times in brightness. In this scale the lower a magnitude, the brighter the object. The faintest magnitude reached by → unaided eye is 6.

From L. magnitudo "greatness, bulk, size," from magnus "great," cognate with Pers. meh "great, large" (Mid.Pers. meh, mas; Av. maz-, masan-, mazant- "great, important," mazan- "greatness, majesty," mazišta- "greatest;" cf. Skt. mah-, mahant-; Gk. megas; PIE *meg- "great") + -tudo, suffix forming abstract nouns from adjectives and participles.

Borz "height, magnitude" (it occurs also in the name of the mountain chain Alborz), related to boland "high," bâlâ "up, above, high, elevated, height," berg "mountain, hill" (Mid.Pers. buland "high;" O.Pers. baršan- "height;" Av. barəz- "high, mount," barezan- "height;" cf. Skt. bhrant- "high;" L. fortis "strong" (Fr. & E. force); O.E. burg, burh "castle, fortified place," from P.Gmc. *burgs "fortress;" Ger. Burg "castle," Goth. baurgs "city," E. burg, borough, Fr. bourgeois, bourgeoisie, faubourg); PIE base *bhergh- "high"). Qadr, from Ar.

magnitude scale
  مرپل ِ برز‌ها   
marpel-e borzhâ

Fr.: échelle de magnitudes   

A scale for measuring and comparing the brightness of astronomical objects.

magnitude; → scale.

magnitude-limited survey
  بردید با برز ِ حدمند   
bardid bâ borz-e haddmand

Fr.: relevé limité en magnitude   

A survey in which the observed objects are bighter than a given → apparent magnitude.

magnitude; → limited; → volume.

Magnus force
  نیروی ِ مگنوس   
niru-ye Magnus

Fr.: force de Magnus   

The force exerted on a spinning object moving through a fluid medium in virtue of → Bernoulli's theorem. The Magnus force can deviate a football from its path when a player strikes it so that it spins about an axis perpendicular to the flow of air around it. As the spinning ball moves through the air, it will create a pressure difference between its two sides. The air travels faster relative to the centre of the ball where its periphery is moving in the same direction as the airflow. This reduces the pressure according Bernoulli's theorem. The opposite effect happens on the other side of the ball, where the air travels slower relative to the centre of the ball. There is therefore an imbalance in the forces that will curve the ball's trajectory.

Named after Heinrich Gustav Magnus (1802-1870), a German chemist and physicist; → force.

magpie
  کلیژ   
kaliž (#)

Fr.: pie   

Any of various passerine birds of the genus Pica, especially Pica pica, having a black-and-white plumage, long tail, and a chattering call (Ditionary.com).

From Mag diminutive of Margaret, used to signify an excessively talkative person + pie the earlier name of the bird, from O.Fr. pie, from L. pica "magpie," feminine of picus "woodpecker."

Kaliž, variant of (Dehxodâ) kalâžé, kalâcé, qalivâš, qalivâj, (Qäyen, Gonâbâd) kaliždak, (Xorâsâni) kelidjak, (Dari Yazd) kelociri, (Bardesir) kerâcik, related to kalâq + dimunitive suffix -iž, vaeiants -iz, -ak.

main
  فریست   
farist

Fr.: principal   

Chief in size, extent, or importance; leading; → principal.

From M.E. meyn, mayn "strength, power," from O.E. mægen "power, strength, force," from P.Gmc. *maginam- "power," from *mag- "to be able, have power."

Farist, literally "foremost" (cf. Mid.Pers. frahist "main, principal, first, much"), from far-, Mid.Pers. fra-; O.Pers. fra- "forward, forth;" Av. frā "forth," pouruua- "first"; cf. Skt. pūrva- "first," pra- "before, formerly;" Gk. pro; L. pro; O.E. fyrst "foremost," superlative of fore, E. fore + -est superlative suffix, Mid.Pers. -ist, -išt-; Av. -išta-, cf. Skt. -istha-, Gk. -istos, O.H.G. -isto, -osto, O.E. -st, -est, -ost.

main beam
  لپ ِ فریست   
lap-e farist

Fr.: lobe principal   

Same as → main lobe.

main; → beam.

main belt
  کمربند ِ فریست   
kamarband-e farist

Fr.: ceinture principale   

The area between → Mars and → Jupiter where most of the → asteroids in our → solar system are found.

main; → belt.

main diagonal
  تراکنج ِ فریست   
tarâkonj-e farist

Fr.: diagonale principale   

In the n x n → matrix , the entities a11, a22, ..., ann.

main; → diagonal.

main lobe
  لپ ِ فریست   
lap-e farist

Fr.: lobe principal   

The lobe in the reception pattern of a radio telescope that includes the region of the maximum received power. Also called major lobe and main beam.

main; → lobe.

Main Ring
  حلقه‌ی ِ فریست   
halqe-ye farist

Fr.: anneau principal   

A thin strand of material encircling Jupiter; the main component in → Jupiter's ring system of three parts. The diffuse innermost boundary begins at approximately 123,000 km. The main ring's outer radius is found to be at 128,940 km,

main; → ring.

main sequence
  رشته‌ی ِ فریست   
ršte-ye farist

Fr.: séquence principale   

An evolutionary stage in the life of a star when it generates its energy by the conversion of hydrogen to helium via → nuclear fusion in its core. Stars spend 90% of their life on the main sequence. On the → Hertzsprung-Russell diagram it appears as a track running from top left (high temperature, high luminosity, high mass) to lower right (low temperature, low luminosity, low mass). See also → zero age main sequence (ZAMS), → terminal age main sequence (TAMS).

main; → sequence.

main-sequence fitting
  سزکرد ِ رشته‌ی ِ فریست   
sazkard-e reshteh-ye farist

Fr.: ajustement par la séquence principale   

The method of determining the distance to a star cluster by overlaying its main sequence on the theoretical zero-age main sequence and noting the difference between the cluster's apparent magnitude and the zero-age main sequence's absolute magnitude.

main sequence; → fitting.

main-sequence turnoff
  رهگشت ِ رشته‌ی ِ فریست   
rahgašt-e rešte-ye farist

Fr.: tournant final de la séquence principale   

The point on the → Hertzsprung-Russell diagram of a star cluster at which stars begin to leave the → main sequence and move toward the → red giant branch. The main-sequence turnoff is a measure of age. In general, the older a star cluster, the fainter the main-sequence turnoff. Same as → turnoff point.

main sequence; → turnoff.

major
  مهین   
mehin (#)

Fr.: majeur   

Greater in size, extent, or importance.

M.E. majour, from O.Fr., from L. major, irregular comparative of magnus "large, great," cognate with Pers. meh "large, great," as below.

Mehin comparative and superlative of meh "great, large" (Mid.Pers. meh, mas; Av. maz-, masan-, mazant- "great, important," mazan- "greatness, majesty," mazišta- "greatest;" cf. Skt. mah-, mahant-; Gk. megas; PIE *meg- "great") + -in superlative suffix.

major axis
  آسه‌ی ِ مهین   
âse-ye mehin

Fr.: grand axe   

The greatest diameter of an ellipse; it passes through the two foci.

major; → axis.

major merger
  تشک ِ مهین   
tašk-e mehin

Fr.: fusion majeure   

The → merging of two spiral galaxies with roughly equal masses colliding at appropriate angles. The dynamical friction is so efficient that the galaxies merge after only a few perigalactic passages.

major; → merger.

major planet
  سیاره‌ی ِ مهین   
sayyâre-ye mehin

Fr.: planète majeure   

A name used to describe any planet that is considerably larger and more massive than the Earth, and contains large quantities of hydrogen and helium. Jupiter and Neptune are examples of major planets.

major; → planète.

major premise
  پیشپایه‌ی ِ مهین   
pišpâye-ye mehin

Fr.: prémisse majeur   

Logic: In a → categorical syllogism, the premise containing the → major term.

major; → premisse.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>