An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory




Number of Results: 432
-žen (#)

Fr.: -gène   

A combining form (also -gene) used in the formation of compound words, meaning: 1) "one that generates:" → hydrogen, → halogen, andogen, and so on. 2) "one that is generated, produced:" exogen, cultigen, phosgene.

From Fr. -gène "producing," Gk. -genes "produced, born," → generate;

-zâyi (#)

Fr.: -génèse   

A combining form of genesis.

From L. genesis, from Gk. genesis "origin, generation," from gignesthai "to be born," related to genos "race, birth, descent," cognate with Pers. zâdan "to bring forth, give birth," → generate.

   -بر، -گوش   
-bar (#), -guš (#)

Fr.: -gone   

A combining form meaning "angled, angular," used in the formation of compound words. → heptagon, → hexagon, → polygon.


From bar "side; breadth; breast," variant var (Mid.Pers. var "breast;" Av. vouru "wide, broad, extended" (vourucašāni- "looking far"), related to varah- "breast;" cf. Skt. urú- "wide, broad," úras- "breast;" Gk. eurus "wide, broad;" PIE base uer-, ueru-s"wide, broad"); -guš "corner, angle," Mid.Pers. gošak "corner."

-negâšt (#)

Fr.: -gramme   

A combining form meaning "something drawn, written" (diagram, spectrogram, oscillogram).

From Gk. -gramma, combining form of gramma "something written or drawn," → graph.

-Negâšt, from negâšt "drawn, written;" p.p. of negâštan, negârdan "to paint, write," → graph.

-negâr (#)

Fr.: -graphe   

A suffix meaning "drawn, written," specialized in meaning to indicate the instrument rather than the written product of the instrument.

A suffix, from Gk. -graphos "(something) drawn or written, one who draws or writes," from graphein "to draw, write."

A suffix from the stem of negârdan, negâštan "to paint, write," → graph.


Fr.: -graphique   

An adjective relating to → -graph.

-graph + → -ic.

-negâri (#)

Fr.: -graphie   

A combining form denoting a process or form of drawing, writing, representing, recording, describing, etc., or an art or science concerned with such a process. Examples: geography; orthography; → photography; → radiography; → selenography; → tomography.


G band
  باند ِ G   
bând-e G

Fr.: bande G   

A conspicuous band of molecular → CH (methylidine) at 4300 Å, which is present in the spectra of late-type G-K stars.

G refers to → G type stars in the spectra of which this feature is strong. → band.

g mode
  ترز ِ g، مُد ِ ~   
tarz-e g, mod-e ~

Fr.: mode g   

Waves trapped inside stars, whose restoring force is the → buoyancy. Same as → gravity mode. See also: → oscillation modes; → p mode; → f mode.

g referring to gravity; → mode.

G ring
  حلقه‌ی ِ G   
halqe-ye G

Fr.: anneau G   

The → Saturn's ring, with a width of 8,000 km, lying before the → F ring, at 164,000-172,000 km from the center of Saturn.


G star
  ستاره‌ی G   
setâre-ye G

Fr.: étoile G   


G, from the → Harvard classification; → star.

G type star
  ستاره‌ی ِ گونه‌ی ِ G   
setâre-ye gune-ye G

Fr.: étoile de type G   



G-type asteroid
  سیارک ِ گونه‌ی ِ G   
sayyârak-e gune-ye G

Fr.: astéroïde de type G   

A relatively uncommon → carbonaceous carbonaceous asteroid whose spectrum contains a strong → ultraviolet  → absorption feature below 0.5 μm (→ Tholen classification). In the → SMASS classification it corresponds to the Cg and Chg types , depending on the presence or absence (respectively) of the absorption feature at 0.7 μm. The most remarkable "asteroid" in this type is → Ceres (now classified as a → dwarf planet).

type; → asteroid.

G-type star
  ستاره‌ی گونه‌ی ِ G   
setâre-ye gune-ye G

Fr.: étoile de type G   

Same as → G star.

G star; → type.

Gaia (#)

Fr.: Gaia   

A → European Space Agency  → astrometry mission launched on 19 December 2013. Gaia's goal is to create the largest and most precise three-dimensional chart of the → Milky Way galaxy by providing unprecedented positional (position on the sky and distance to the Sun) and annual → proper motion measurements for about one billion stars in our Galaxy and throughout the → Local Group. Moreover, the third component of the velocity, the → radial velocity, will be obtained for all stars down to V = 17 mag. Similarly, multi-color photometry will be carried out on all stars down to V = 20 mag. Gaia will achieve the planned astrometric requirements by repeatedly measuring the positions of all objects down to V = 20 mag with final accuracies of about 20 microarcsec at 15 mag. It will provide distances accurate to 20% as far as the → Galactic Center. The satellite is expected to be launched in 2012 and be placed in a → Lissajous orbit around the Sun-Earth → Lagrangian point L2. Gaia is a much more advanced version of the → Hipparcos mission.

Initially, GAIA was the short for Global Astrometric Interferometer for Astrophysics. Although subsequently the interferometer option was abandoned, the acronym was maintained in lower case.

bahré (#)

Fr.: gain   

1) A measure of the → amplification of an electronic device, usually expressed as the ratio of → output power to → input power.
2) → antenna gain.

From M.Fr. gain, from O.Fr. gaaigne, from guaaignier "to obtain," from Germanic *waidanjan "to hunt, plunder," also "to graze, pasture," from P.Gmc. *wartho "hunting ground" (cf. Ger. weide "pasture, pasturage"); PIE base *weiə- "to go after something, strive after."

Bahré, from bahr "part, portion, share, lot;" Av. baxəδra- "portion," from bag- "to attribute, allot," → division.

kahkešâni (#)

Fr.: galactique   

1) Of or pertaining to a → galaxy.

Adjective of → galaxy.

Galactic anticenter
  پادمرکز ِ کهکشان   
pâdmarkaz-e kahkešân

Fr.: anticentre galactique   


galactic; → anticenter.

galactic bar
  میله‌ی ِ کهکشانی   
mile-ye kahkešâni

Fr.: barre galactique   


galactic; → bar.

Galactic bulge
  کوژ ِ کهکشان   
kuž-e kakhašân

Fr.: bulbe de la Galaxie   

The central → galaxy bulge of the → Milky Way.

galactic; → bulge.
