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: 1298
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.

self-awareness
  خود-آگاهی، خویشتن‌آگاهی   
xod-âgâhi, xištan-âgâhi

Fr.: connaissance de soi   

The → state or → condition of being aware of one's own → personality or → individuality.

self-; → awareness.

self-gravitating
  خود-گراننده   
xod-gerânandé

Fr.: auto-gravitant   

The characteristic of a system of masses, such as a star, kept together by mutual gravity.

self; → gravitate.

self-gravity
  خود-گرانی   
xod-gerâni

Fr.: auto-gravité   

The → gravitational attraction of a system of masses, such of a planet, that allows the system to be held together by their mutual gravity. Self-gravity between atoms allows a → star to hold together, despite tremendous temperature and pressure. Similarly, to be considered a → planet, a body must have enough mass so that its self-gravity pulls it into a near-spherical shape.

self-; → gravity.

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