An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian
فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک
M. Heydari-Malayeri - Paris Observatory
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Zhevakin's zone zonaar-e Zhavakin Fr.: zone de Zhevakin One of several regions of the stellar interior where increased → opacity can provide the necessary → valve mechanism to drive → stellar pulsations. Also called → partial ionization zone. Named after the Russian astronomer Sergei A. Zhevakin (1916-2001), who identified these zone in the 1950s; → mechanism. |
zircon zargun (#) Fr.: zircon A common mineral, zirconium silicate, ZrSiO4, occurring in small tetragonal crystals. The color is variable, usually brown to reddish brown, but also colorless, pale yellowish, green, or blue. A red variety, used as a gem, is called hyacinth. Zircon contains trace amounts of uranium and thorium and therefore can be used for radiometric datings. Also called jargon. From Ger. Zirkon, from Ar. zarqun "cinnabar, bright red," from Pers. zargun "gold-colored," from zar→ gold + -gun "resembling; manner, fashion; color" (Mid.Pers. gônak "kind, species;" Av. gaona- "color"). |
zirconium zirkoniom (#) Fr.: zirconium A metallic chemical element; symbol Zr. Atomic number 40; atomic weight 91.22; melting point about 1,852°C; boiling point 4,377°C; specific gravity 6.5 at 20°C. Zirconium was discovered in the mineral zirconia by the German chemist Martin-Heinrich Klaproth in 1789. It was first isolated by the Swedish chemist Jons Jacob Berzelius in 1824 in an impure state and finally by the chemists D. Lely Jr. and L. Hamburger in a pure state in 1914. From → zircon. |
zirconium oxide, ZrO oksid-e zirkoniom Fr.: oxide de zirconium A → diatomic molecule made up of → zirconium and → oxygen atoms. See → ZrO band. |
zone zonâr (#) Fr.: zone The portion of the surface of a sphere included between two parallel planes. From L. zona "geographical belt, celestial zone," from Gk. zone "a belt," related to zonnynai "to gird," from PIE base *yes- "to gird, girdle;" cognate with Pers. parhun "circle," as below. Zonâr most probably loan from from Gk., as above; it is related to Pers. parhun "circle," ultimately from Proto-Iranian *pari-iâhana- "girdle, belt," from pari-, variant pirâ-, → circum-, + iâhana- "to girdle," cf. Av. yâh- "to girdle." The Pers. pirâhan "shirt" is a variant of parhun. |
zone of avoidance zonâr-e tosneš Fr.: zone d'évitement, zone vide The region on the sky covered by the plane of the → Milky Way. It is characterized by an apparent absence of galaxies, due to the obscuring effect of → interstellar dust in the → Galactic plane. |
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