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
segmented mirror
  آینه‌ی ِ برنکیده   
âyen-ye borankidé

Fr.: miroir segmenté   

A large telescope mirror consisting of smaller mirror segments designed to act as a single, larger reflecting surface. Because current monolithic mirrors cannot be constructed larger than about eight meters in diameter, the use of segmented mirrors is a key component for larger aperture telescopes.

Segmented, p.p. of → segment (v.); → mirror.

segregate
  سواییدن   
savâyidan

Fr.: séparer, isoler   

To separate or set apart from others or from the main body or group; isolate.

From M.E. segregat, from L. segregatus, p.p. of segregare "separate from the flock, isolate, divide," from se- "apart from" + greg-, ablative of grex, gregis "herd, flock, crowd," cf. Gk. gergera "swarm, flock;" maybe related to Old Khotanese -gris- in hamgris- "to assemble."

Savâyidan, from savâ "separate, apart;" probably related to Mid.Pers. s'w- "to crush," sây- "to rub, wear, tear;" cf. Kurd. (Hawramân) sawa, Roshani sêw-/sêwt, Bartangi siw-/siwd, Yazghulani saw-/sed, Bajui sâw-/sâwd "to rub, smear, grind" (Cheung 2007); Mod.Pers. sây-/sudan "to rub, wear, tear, grind, dissolve;" cf. Skt. śā- "to sharpen, whet."

segregation
  سوایش   
savâyeš

Fr.: ségrégation   

The act or practice of segregating. The state or condition of being segregated. → mass segregation.

Verbal noun of → segregate.

seismic
  لرزه‌ای   
larze-yi (#)

Fr.: sismique   

Of, subject to, or caused by → vibrations of the → Earth. → seismic wave.

From seism, → seismo-, + → -ic.

seismic wave
  موج ِ لرزه‌ای   
mowj-e laez-yi (#)

Fr.: onde sismique   

An → elastic wave generated in the → Earth by an → impulse such as an → earthquake or an → explosion. Seismic waves may travel either along or near the Earth's surface or through the Earth's interior.

seismic; → wave.

seismo-
  لرزه-   
larzé- (#)

Fr.: sismo-   

A combining form meaning "earthquake;" → seismology, → seismograph, etc.

From Gk. seismo- combining form of seismos "shock, earthquake," from seiein "to shake."

Larzé-, from larzé "shaking, trembling," from larzidan "to tremble, shiver;" Mid.Pers. larzidan "to shake, tremble;" Manichean Mid.Pers. rarz- "to shiver with fever;" Proto-Iranian *rarz- "to shake, tremble."

seismograph
  لرزه‌نگار   
larzenegâr (#)

Fr.: sismographe, séismographe   

An instrument that detects, magnifies, and records → seismic waves, especially those caused by → earthquakes or → explosions.

seismo-; → -graph.

seismology
  لرزه‌شناسی   
larzešenâsi (#)

Fr.: sismologie, séismologie   

The branch of geophysics that is concerned with the study of earthquakes and measurement of the mechanical properties of the Earth.

seismo-; → -logy.

seldom
  پرزانه   
perzâné

Fr.: rarement   

Not → often; rarely.

M.E., from O.E. seldum, variant of seldan; cognate with Ger. selten, Goth. silda-, Dutch zelden.

Adverb from perz, → rare.

select
  گزیدن   
gozidan (#)

Fr.: sélectionner, choisir   

To choose from among several.

From L. selectus, p.p. of seligere "to choose out, gather apart," from se- "apart" + legere "to gather, select."

Gozidan "to select, choose;" Mid.Pers. vicitan, wizidan, wizin- "to choose, select, discriminate," related to cin-, cidan "to gather, collect;" Av. vicidāi- "to discern," viciθa- "separation, discernment;" from vi- "apart, away from" (O.Pers. viy- "apart, away;" cf. Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + kay- "to choose;" cf. Skt. ci- "to gather, heap up," cinoti "gathers."

selection rule
  رزن ِ گزینش   
razan-e gozineš

Fr.: règle de sélection   

Any of a set of rules specifying the relationships between the → quantum numbers that characterize the initial and final states of a quantum-mechanical system in a → discrete transition. Transitions that do not agree with the selection rules are called → forbidden and have considerably lower probability. There are several types of selection rules (→ rigorous selection rule, → LS coupling, etc.) for → electric dipole transition (→ permitted), → magnetic dipole (forbidden), electric → quadrupole (forbidden), etc.

Selection, verbal noun of → select; → rule.

selective absorption
  درشم ِ گزینشی   
daršam-e gozineši

Fr.: absorption sélective   

Absorption which varies with the wavelength of radiation incident upon an absorbing substance.

Selective, verbal noun of → select; → absorption.

selective scattering
  پراکنش ِ گزینشی   
parâkaneš-e gozineši

Fr.: diffusion sélective   

A type of scattering that occurs when certain → particles are more effective at scattering a particular → wavelength of light, as in → Rayleigh scattering.

selective; → scattering.

selenehelion
  ماه‌گرفت ِ افقی   
mâhgereft-e ofoqi

Fr.: selenelion   

Same as → horizontal eclipse.

From Gk. selene "Moon," related to sela "light, brightness, flame," + helion, → sun.

horizontal eclipse.

selenelion
  ماه‌گرفت ِ افقی   
mâhgereft-e ofoqi

Fr.: selenelion   

Same as → horizontal eclipse.

From Fr. selenelion, contraction of → selenehelion.

horizontal eclipse.

selenocentric
  ماه‌مرکزی   
mâh-markazi

Fr.: sélénocentrique   

Referring to or pertaining to the center of the Moon.

Formed on the model of → geocentric, from seleno- combining form of Gk. selene "moon" + -centric, from → center + → -ic.

Mâh-markazi, from mâh, → moon, + markazi, from markaz, → center, + -i, → -ic.

selenocentric gravitational constant
  پایای ِ گرانشی ماه‌مرکزی   
pâyâ-ye gerâneši-ye mâh-markazi

Fr.: constante gravitationnelle sélénocentrique   

A parameter representing the product of the → gravitational constant by the → lunar mass. It is 49.03 x 1011 m3 s-2.

selenocentric; → gravitational; → constant.

selenography
  ماه‌نگاری   
mâh-negâri (#)

Fr.: sélénographie   

Topographic description and charting of the surface of the Moon.

From seleno- combining form of Gk. selene "moon" + → -graphy.

Mâh-negâri, from mâh, → moon + negâri, → -graphy.

self-
  خود-   
xod- (#)

Fr.: auto-   

A combining form of self with a range of related meanings.

From M.E., from O.E. self, seolf, sylf "one's own person, same;" cf. O.Fris. self, Du. zelf, O.H.G. selb, Ger. selbst.

Xod-, from xod; Mid.Pers. xwad "self; indeed;" Av. hva- "self, own."

self-absorption
  خود-درشم   
xod-daršam

Fr.: auto-absorption   

The decrease in the radiation from a material caused by the absorption of a part of the radiation by the material itself.

self-; → absorption.

<< < -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 > >>