An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



<< < -oi obj obs obs oce Of? ohm omn opa Oph opt opt ora orb ore Ori ort osm out Owl > >>

Number of Results: 397
Owl Nebula
  میغِ بوف، ~ِ جغد   
miq-e buf, ~ joqd

Fr.: Nébuleuse de la Chouette   

A planetary nebula in the constellation → Ursa Major, one of the four planetary nebulae in → Messier catalog. It is one of the more complex planetary nebulae known. Its appearance has been interpreted as that of a cylindrical torus shell viewed obliquely, so that the projected matter-poor ends of the cylinder correspond with the Owl's eyes. Also known as M97 or NGC 3587.

Discovered by Pierre Méchain in 1781, the name goes back to Lord Rosse, who first used it in 1848. Owl, from O.E. ule, from P.Gmc. *uwwalon (cf. Du. uil, O.H.G. uwila, Ger. Eule), a diminutive of root *uwwa, which is imitative of an owl's hoot (cf. L. ulula "owl;" Gk. ololyzein "to cry aloud," Skt. uluka- "owl.;" → nebula.

Miq, → nebula; buf "owl;" Mid.Pers. bûf "owl," Av. buxti- "hiss, howling;" cf. Skt. bukk- "to bark, yelp;" Gk. buas "owl;" L. bubo "owl" (Fr. hibou); Arm. bou "owl." Joqd "owl," probably related to jiq "shreak, clamour, cry."

  ا ُکسنده   
oksandé (#)

Fr.: oxydant   

The substance which supplies the → oxygen in an → oxidation → reaction. Same as → oxydizing agent agent and → oxidizer.

Agent noun from → oxidize.

  ا ُکسایش   
oksâyeš (#)

Fr.: oxydation   

The combination of → oxygen with a substance, or the removal of → hydrogen from it.

Verbal noun of → oxidize.

oxidation number
  شمار ِ اکسایش   
šomâr-e oksâyeš

Fr.: nombre d'oxydation   

The total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom. In other words, the charge that atom would have if the compound was composed of ions. The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. Same as → oxidation state.

oxidation; → number.

oxidation state
  استات ِ اکسایش   
estât-e oksâyeš

Fr.: état d'oxydation   

Same as → oxidation number.

oxidation; → state.

  ا ُکسید   
oksid (#)

Fr.: oxyde   

A compound of → oxygen and another → chemical element.

From Fr. oxyde, from oxygène, → oxygen and acide, → acid.

  ا ُکسیدنی   
oksidani (#)

Fr.: oxydable   

Capable of undergoing a → chemicalreaction with → oxygen.

oxidize + → -able.

  ا ُکسیدن   
oksidan (#)

Fr.: oxyder   

To convert a → chemical element into an → oxide; combine with → oxygen.

oxide + → -ize.

  ا ُکسیده   
oksidé (#)

Fr.: oxydé   

Combined with or having undergone a chemical → reaction with → oxygen.

Past participle of → oxidize.

  ا ُکسنده   
oksandé (#)

Fr.: oxydant   

A substance that → oxidizes another substance. Same as → oxidant and → oxidizing agent.

Agent noun from → oxidize.

oxidizing agent
  کنشگر ِ اکسنده   
konešgar-e oksandé

Fr.: oxydant   

A substance that brings about an → oxidation. Same as → oxidant and → oxidizer.

oxide; → -ize; → -ing; → agent.

oksižen (#)

Fr.: oxygène   

A gaseous → chemical element; symbol O. Oxygen is the most abundant element in the → Universe not produced in the → Big Bang, and the third most common overall. It is a colorless, tasteless, odorless gas that is the second most abundant constituent of dry air (20.95% by volume). → Atomic number 8; → atomic weight 15.9994; → melting point -218.4°C; → boiling point -182.962°C; → density 1.429 grams per liter at STP. Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele, in 1772. Joseph Priestley, an English chemist, independently, discovered oxygen in 1774 and published his findings the same year, three years before Scheele published. Antoine Lavoisier, a French chemist, also discovered oxygen in 1775, was the first to recognize it as an element.

From Fr. oxygène, literally "acid former," coined in 1777 by the Fr. chemist Antoine-Laurent Lavoisier (1743-1794), from Gk. oxys "sharp, acid" + Fr. -gène "something that produces" from Gk. -genes "formation, creation" (cognate with Pers. zâdan "to bring forth, give birth;" Mid.Pers. zâtan; Av. zan- "to bear, give birth to a child, be born," infinitive zazāite, zāta- "born;" cf. Skt. janati "begets, bears;" L. gignere "to beget," nasci "to be born," as above, PIE base *gen- "to give birth, beget").

Oksižen, loan from Fr., as above.

oxygen burning
  سوزشِ اکسیژن   
suzeš-e oksižen

Fr.: combustion de l'oxygène   

The stage when a star fuses → oxygen into → silicon and → sulfur. It occurs only in → massive stars, with a mass over eight → solar masses.

oxygen; → burning.

ozon (#)

Fr.: ozone   

A form of oxygen, O3, in which the molecule is made of three atoms instead of the usual two.

From Ger. Ozon, coined in 1840 by Ger. chemist Christian Friedrich Schönbein (1799-1868) from Gk. ozon, neute pr.p. of ozein "to smell." So called for its peculiar odor.

ozone hole
  سوراخِ اُزون   
surâx-e ozon (#)

Fr.: trou d'ozone   

Not really a "hole," but a region of exceptionally depleted ozone in the stratosphere over the Antarctic that happens at the beginning of Southern Hemisphere spring (August-October). It was first noticed in the 1970s by a research group from the British Antarctic Survey.

ozone; → hole.

ozone layer
  لایه‌یِ اُزون   
lâye-ye ozon (#)

Fr.: couche d'ozone   

An atmospheric layer that contains a high proportion of oxygen that exists as ozone. It acts as a filtering mechanism against incoming ultraviolet radiation. It is located between the troposphere and the stratosphere, around 15 to 20 kilometers above the Earth's surface.

ozone; → layer.

ozone shield
  سپرِ اُزون   
separ-e ozon (#)

Fr.: bouclier d'ozone   

The ozone layer within the stratosphere that filters out potentially lethal intensities of ultraviolet radiation from the Sun.

ozone; shield, from O.E. scield, scild, related to sciell "seashell, eggshell," from P.Gmc. *skeldus (cf. Du. schild, Ger. Schild, Goth. skildus); PIE base *(s)kel- "to cut."

Separ "shield," from Mid.Pers. spar "shield;" cf. Skt. phalaka- "board, lath, leaf, shield," phálati "(he) splits;" Gk. aspalon "skin, hide," spolas "flayed skin," sphalassein "to cleave, to disrupt;" O.H.G. spaltan "to split;" Goth. spilda "board;" PIE base *(s)p(h)el- "to split, to break off;" → ozone.

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