An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 1259
canonical momentum
  جنباکِ هنجاروار   
jonbâk-e hanjârvâr

Fr.: moment cinétique canonique   

Same as → conjugate momentum.

canonical; → momentum.

canonical upper limit
  حد ِ زبرین ِ جرم   
hadd-e zabarin-e jerm

Fr.: limite supériure canonique   

A physical upper mass limit near 150 Msun assumed for the stellar → initial mass function (Kroupa et al. 2012, arXiv:1112.3340).

canonical; → upper; → limit.

canonically conjugate variable
  ورتنده‌یِ هنجاروارانه همیوغ   
vartande-ye hanjârvârâné hamyuq

Fr.: variable canoniquement conjuguée   

A generalized coordinate and its → conjugate momentum.

Canonically, adverb from → canonical; → conjugate; → variable.

Canopus (α Carinae)
  سهیل، اگست، پرک   
Soheyl (#), Agast (#), Parak (#)

Fr.: Canopus   

The brightest star in the → constellation  → Carina and the second brightest star in the sky with a → visual magnitude -0.72. Also called α Carinae and HD45348. Canopus is not visible from latitudes above 37 degrees north. It is an evolved star, a → supergiant of type F0 II (Smiljanic et al., 2006, A&A 449, 655). Canopus lies 310 → light-years (96 → parsecs) from the Solar System; this is based on its → Hipparcos  → parallax measurement of 10.43 mas (5% accuracy). From this distance a → luminosity 13,300 times that the → solar luminosity is derived, and a radius of 73 times solar, in agreement with the → angular size (6.95 ± 0.15 mas) measured using → interferometry (Cruzalèbes et al., 2013, arXiv:1306.3288). These observations also yield an → effective temperature of about 7400 K. The star's mass is estimated to be about 8 Msun. Canopus possesses an extremely hot magnetically heated → corona. Canopus's corona is some 10 times hotter than the → solar corona and produces both observable → X-rays and → radio emission. According to calculations by J. Tomkin (1998, Sky & Telescope 95, 59), using → Hipparcos data, Canopus has, in the past, been the brightest star during three periods: from 3,700,000 to 1,370,000 years ago, from 950,000 to 420,000 years ago, and from 160,000 to 90,000 years ago. It will, once more, become the brightest star in 480,000 years and will remain such for 510,000 years.

Canopus, from Gk. kanobos, perhaps from Coptic language Kahi Nub "golden earth."

Soheyl, from Ar. Suhail.
Agast, either a loan from Skt., or a possible, vanished Av. counterpart of Skt. Agasti, Agastya. The Skt. word derives from aga- "mountain," and asti- "thrower." In Vedic literature, Canopus is associated with the sage Agastya, one of the ancient rishis. The star is said to be the "cleanser of waters" because of turbid waters becoming clean at its rising.
Parak, of unknown etymology.

kolâhak (#)

Fr.: calotte   

1) A covering for the head.
2) The top part of something (such as a hill or mountain). → polar cap.
3) A removable cover or lid.

M.E. cappe; O.E. cæppe "hood, head-covering," from L.L. cappa "a cape, hooded cloak," possibly shortened from capitulare "headdress," from L. caput "head;" cf. Pers. Lori kapu "head," kapulek "skull, middle of the head;" Kurd. Kurmanji qaf "head;" Pashto kaparay "skull;" Farâhâni kapâl "a blow on the head."

Kolâhak, diminutive of kolâh "cap;" maybe related to PIE base *kel- "conceal;" cf. L. celare "to hide, conceal," occulere "to dissimulate;" Gk. kalyptein "to cover," kalia "hut, nest;" Skt. cala "hut, house;" Goth. hilms "helmet," huljan "cover over," hulistr "covering;" E. hull "seed covering," from O.E. hulu, from O.H.G. hulla, hulsa; O.E. hol "cave;"


Fr.: capacité   

The ratio of the charge Q on either conductor of a → capacitor to the → potential difference, or → voltage V between the conductors. It is given by C = Q/V. Capacitance can also be described by the relation: C = ε0A/d, where ε0 is the → permeability of free space, A is the area of one capacitor plate, and d is the distance between the capacitor plates. Capacitance is measured in → farads or, for convenience, in microfarads.

From capacit(y), → capacity + → -ance, a suffix used to form nouns either from adjectives in -ant or from verbs.

Gonjâyi, from gonjâ "able to hold," from gonjidancapacity + -yi noun suffix.


Fr.: condensateur   

A device for storing electric charge. The simplest sort of capacitors consists of two parallel, conductive plates having equal amounts of opposite charges and separated by a → dielectric material. When a capacitor is fully charged there is a → potential difference between its plates. The larger the area of the plates and/or the smaller the separation between them the greater will be the charge that the capacitor can hold and the greater will be its → capacitance. The actual charge Q on the plates of a capacitor is given by: Q = C . V, where C is the capacitance and V the → voltage.

From capacit-, from → capacity + → -or.

From gonjân transitive stem of gonjidan "to be contained; to hold exactly; to be filled," → capacity, + -gar, → -or.

gonjâyeš (#)

Fr.: capacité   

The ability to receive or contain.
Electricity: → capacitance.

From M.Fr. capacité, from L. capacitatem, from capax "able to hold much," from capere "to take, grasp."

Gonjâyeš "capacity, holding, containing," from gonjdan "to be contained; to hold exactly; to be filled;" Mid.Pers. winj- "to be contained;" Proto-Iranian *uiac-/*uic-; cf. Skt. vyac- "to contain, encompass," vyás- "extent, content, extension;" L. uincire "to bind."

Capella (α Aurigae)
  بزبان، عیوق   
Bozbân (#), Ayyuq (#)

Fr.: Capella   

The sixth brightest star in the sky, Capella lies in the Northern Hemisphere → constellation  → Auriga. A → spectroscopic binary, it consists of a pair of G5 and G0 → giants, themselves multiple systems. Capella lies 42 light-years away.

From L. capella "little she-goat," diminutive of caper "goat."

The Pers. name of Capella is Bozbân "goat keeper," as indicated by Biruni (A.D. 973-1048) in his Tafhim, from boz "goat" (Mid.Pers. buz, Av. buza-, Skt. bukka-, O.Ir. bocc, O.H.G. boc, Bret. bouc'h) + -bân prefix denoting "keeper." Ayyuq, from Ar.

muyinegi (#)

Fr.: capillarité   

Same as → capillary action.

capillary; → -ity.

  مویین، مویینه   
muyin (#), muyiné (#)

Fr.: capillaire   

1) Resembling a strand of hair; hairlike.
2) Pertaining to or occurring in or as if in a tube of fine bore.
3) Physics: Pertaining to → capillarity.
4) Anatomy: One of the minute blood vessels between the terminations of the arteries and the beginnings of the veins (

From L. capillaris "pertaining to hair," from capillus "hair."

Muyin, muyiné, from mu(y), → hair.

capillary action
  ژیرش ِ مویینه، مویینگی   
žireš-e muyiné, muyinegi

Fr.: capillarité   

The ability of a → liquid to → flow in a → narrow space, such as a thin → tube, without the assistance of, and in opposition to, external forces like → gravity. Also called → capillarity. It occurs because of intermolecular → attractive forces between the liquid and solid surrounding surfaces. If the diameter of the tube is sufficiently small, then the combination of → surface tension (which is caused by → cohesion within the liquid) and → adhesion (between the liquid and the → container) acts to lift the liquid. The capillarity of the liquid is high when adhesion is greater than cohesion. For example, water in a thin glass tube has strong → adhesive forces due to the hydrogen bonds that form between the water molecules and the oxygen atoms in the glass wall (made of → silica, SiO2). In contrast, mercury is characterized by stronger cohesion, and hence its capillarity is much lower.

capillary; → action.

Capricorn, Tropic of
  هورگردِ وهیگ   
hurgard-e vahig

Fr.: Tropique du Capricorne   

Tropic of Capricorn.



Fr.: Capricorne   

The Sea Goat. The smallest → constellation of the → Zodiac, lying in the Southern Hemisphere at approximately R.A. 21h, Dec. -20°. Abbreviation Cap; genitive form Capricorni.

L. Capricornus "horned like a goat," from caper "goat" + cornu "horn" (Gk. karnon, Skt. srnga-, Av. sru-, srvâ-, Mid.Pers. sruw, Mod.Pers. soru, P.Gmc. *khurnaz, Ger. Horn, E. horn, PIE *ker- "head, horn, top, summit"), a translation of Gk. Aigokheros, the name of the constellation.

Vahig, Mid.Pers. "goat," the name of the Capricorn sign in Mid.Pers. texts, Mod.Pers. bahi, as mentioned by Biruni in his Athar al-Baqia written around A.D. 1000.


Fr.: légende   

1) A title or explanation for a picture or illustration, especially in a magazine.
2) A heading or title, as of a chapter, article, or page (

M.E. capcio(u)n "taking, seizure," from capcion "arrest, capture, imprisonment," or directly from L. caption-, from capt(us) "taken," → capture.

Kapéš "taking, capture," verbal noun from kapidan "to seize, take, capture," related to qâpidan, qâp zadan "to rob, to seize," Malâyeri qapâl "robbing, seizure, robbing," probably related to L. capere, → capture.

  گیر‌افت، گیر‌اندازی   
gir-oft, gir-andâzi (#)

Fr.: capture   

The process in which an atomic, nuclear, or astronomical system acquires an additional particle or body.

From M.Fr. capture "a taking," from L. captura "a taking," from captus p.p. of capere "to take, hold, seize;" PIE base *kap- "to grasp" (cf. Skt. kapati "measure equal to the capacity of the hollows of the two hands joined;" Gk. kaptein "to swallow;" O.Ir. cacht "servant-girl," literally "captive;" Goth. haban "have, hold;" O.E. habban, E. have "to have, hold;" probably Mod.Pers. qâp-, qâpidan, kapidan "to seize, rob").

Gir-oft, composite verb from gir + oft. Gir "take, seize, hold," from gereftan, from O.Pers./Av. grab- "to take, seize," cf. Skt. grah-, grabh- "to seize, take," graha- "seizing, holding, perceiving," M.L.G. grabben "to grab," from P.Gmc. *grab, E. grab "to take or grasp suddenly;" PIE *ghrebh- "to seize." Oft, from oftâtan "to fall; to befal, happen," Mid.Pers. opastan, Av. pat- " to fly, fall, rush," Skt. patati "he flies, falls," L. petere "to fall, rush out," Gk. piptein "to fall," PIE base *pet- "to fly, to rush." Gir-andâzi, from gir + andâzi, verbal noun from gir-andâxtan "to throw, cast; to do, make."


Fr.: carbo-   

A combining form used in the names of → chemical compounds in which → carbon is present. Also, especially before a vowel, carb-.

From → carbon.


Fr.: glucide, hydrate de carbone   

A molecular compound made from just three → chemical elements: → carbon, → hydrogen, and → oxygen. Carbohydrates have the general molecular formula CxH2yOy, and thus were once thought to represent "hydrated carbon." However, the arrangement of atoms in carbohydrates has little to do with → water molecules. Carbohydrates are a source of energy for the body. They include sugars, starches, cellulose and many other compounds found in living organisms. In their basic form, carbohydrates are simple sugars or monosaccharides.

carbo-; → hydrate.

karbon (#)

Fr.: carbone   

Nonmetallic chemical element; symbol C. → Atomic number 6; → atomic weight 12.011; → melting point about 3,550°C; → boiling point 4,827°C. The most abundant isotope of carbon is 12C. Carbon is one of the most important elements for life. The burning of carbon in the form of coal and oils has been essential in the development of industrial societies. It is the element that hardens → steel and the sole element in → diamonds. The carbon in nature is produced inside massive stars. → triple-alpha process; → Hoyle state.

Carbon, from Fr. carbone, coined by Antoine Lavoisier (1743-1794) to distinguish it from charbon (Fr.) "charcoal," from L. carbo (genitive carbonis) "a coal, charcoal."

carbon burning
  سوزش ِ کربون   
suzeš-e karbon

Fr.: combustion du carbon   

The stage in the evolution of a star after → helium burning when the core of the star consists mainly of carbon and oxygen. In stars of mass greater than about 8 solar masses, whose cores reach a temperature above 5 × 108 K and density above 3 × 109 kg m-3, carbon burning can begin via reactions such as the following:
12C + 12C → 20Ne + 4He
12C + 12C → 23Na + p
12C + 12C → 23Mg + n.
The time-scale for this phase of → nucleosynthesis is of order of five hundred years.

carbon; → burning.

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