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: 7 Search : see
see
  دیدن   
didan (#)

Fr.: voir   

To perceive with the eyes; look at.

M.E. seen, from O.E. seon "to see, look, behold, understand, know," ultimately from PIE *sekw- "to see, notice;" cognate with Du. zien "to see," Ger. sehen "to see," Danish, Swedish and Norwegian Bokmal se "to see," L. signum "mark, token."

Didan "to see, regard, catch sight of, contemplate, experience;" Mid.Pers. ditan; O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen."

Seebeck effect
  اسکر ِ زیبک   
oskar-e Seebeck

Fr.: effet de Seebeck   

An → electromotive force produced in a closed electric circuit formed by connecting conductors of different metals in series when the two junctions junctions are maintained at different temperatures. The circuit constitutes a → thermocouple.

Named for the German physicist Thomas Seebeck (1770-1831), who discovered the effect; → effect.

seed
  تخم   
toxm (#)

Fr.: germe   

A small single crystal of a semiconductor from which is grown the large single crystal for the manufacture of semiconductor devices.

O.E. sed, sæd; cf. O.N. sað, O.S. sad, O.Fris. sed, M.Du. saet, O.H.G. sat, Ger. Saat; PIE base *se- "to sow."

Toxm "seed" (Tabari tim "seed; race," Laki tôm "seed"), from Mid.Pers. tôhm, tôhmak, tôm, tuxm "seed; extraction; descent;" Av. taoxman- "seed;" O.Pers. taumī:- "family;" cf. Skt. tókman- "offspring, children, race, child," tokma- "young shoot, young blade of corn."

seed nucleus
  هسته‌ی ِ تخم   
haste-ye toxm

Fr.: noyau germe   

A nucleus from which a variety of → fusion  → chain reactions derive in → stellar nucleosynthesis.

seed; → nucleus.

seeing
  شکان   
šekân

Fr.: seeing   

A measure of the blurring and degradation of the image of astronomical objects caused by → turbulence in the Earth's atmosphere, including the telescope environment. Seeing causes the images of stars to break up into → speckle patterns, which change very rapidly with time. See also → Fried parameter; → differential image motion monitor.

see; → -ing.

Šekân "wrinkle, plait; curl; rupture, breach," variant of šekan "fold, curl; ripples on water," from šekastan "to break, split;" Mid.Pers. škastan "to break;" Av. scind-, scand "to break, cleave;" Proto-Iranian *skand- "to break, cleave;" PIE sken- "to cut off."

seeing disk
  گرده‌ی ِ شکان، دیسک ِ ~   
gerde-ye šekân, disk-e ~

Fr.: tache de seeing   

The angular size of a stellar image for long exposures, as determined by the ratio λ/r0, where λ is the wavelength and r0 the typical size of → turbulence patches. → Fried parameter. The most common seeing measurement is the → full-width at half-maximumof the seeing disk. → Airy disk.

seeing; → disk.

seeing monitor
  پهره‌گر ِ شکان   
pahregar-e šekân

Fr.: moniteur de seeing   

An optical instrument that follows the variation of → atmospheric turbulence by continuously measuring the → seeing conditions.

seeing; → monitor.