# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13048 Search : far
 cattle   دام   dâm (#)Fr.: bétail   Domesticated quadrupeds held on a farm, especially oxen, bulls, and cows.M.E. catel, from M.Fr. catel "property" (O.Fr. chatel), from M.L. capitale "property, stock," from L. capitalis "principal, chief," literally "of the head," from caput, → head.Dâm, originally "nonferocious animal," especially "herbivorous quadrupeds such as cows, sheep, etc.;" Mid.Pers. dâm "creature, creation;" O.Pers. dā- "to put, make, create;" Av. dā- "to place, put, create," dāmay- "creation; creating; creator," dāmi.dāt- "creating the creation;" cf. Skt. dhā- "to put, to place;" Gk. tithemi "to put, to place;" L. facere "to do;" O.H.G. tuon; E. to do. Cauchy's equation   هموگش ِ کوشی   hamugeš-e CauchyFr.: équation de Cauchy   A relationship between the → refractive index (n) and the wavelength of light (λ) passing through a medium. It is commonly stated in the following form: n = A + B/λ2 + C/λ4, where A, B, and C are constants characterizing the medium. The two-component Cauchy equation is n = A + B/λ2, from which the dispersion becomes dn/dλ = -2B/λ3 showing that dispersion varies approximately as the inverse cube of the wavelength. The dispersion at 4000 A will be about 8 times as large as at 8000 Å.Named after Augustin Louis Cauchy (1789-1857), French mathematician and physicist who found the first equation of dispersion in 1836; → equation. Cauchy's theorem   فربین ِ کوشی   farbin-e CauchyFr.: théorème de Cauchy   If f(x) and φ(x) are two → continuous functions on the → interval [a,b] and → differentiable within it, and φ'(x) does not vanish anywhere inside the interval, there will be found, in [a,b], some point x = c, such that [f(b) - f(a)] / [φ(b) - φ(a)] = f'(c) / φ'(c). causal   بناری، بنارمند   bonârmand, bonâriFr.: causal   Of, involving, or constituting a cause; indicative of or expressing a cause.Adj. from → cause. causal structure   ساختار ِ بنارمند   sâxtâr-e bonârmandFr.: structure causale   In → special relativity, the causal relationship between → events involving a → light cone.→ causal; → structure. causality   بنارمندی   bonârmandiFr.: causalité   The relationship between causes and effectsCausality, from → causal + -ity.Bonârmandi, from bonâr→ cause + -mand suffix denoting relation, affinity + -i noun forming suffix. causality principle   پروز ِ بنارمندی   parvaz-e bonârmandiFr.: principe de causalité   The principle that cause must always precede effect.→ causality; → principle. causation   بنارش   bonârešFr.: relation de cause à effet   1) The act or process of causing; the act or agency which produces an effect. 2) The relation of → cause to → effect.Verbal noun from → cause. causative   بنارنده   bonârandéFr.: causatif, causal, responsable   1) Effective or operating as a cause or agent. 2) Grammar: Expressing → causation; specifically, being a linguistic form that indicates that the subject causes an act to be performed or a condition to come into being (Merriam-Webster.com).Ultimately from L. causativus, → cause; → -ive. cause   ۱) بنار؛ ۲) بناریدن   1) bonâr; 2) bonâridanFr.: 1) cause; 2) causer   1) A → reason for an → action or → condition; something that brings about an → effect or a → result. 2) To be the cause of; bring about.From L. causa "reason, purpose," of unknown origin.Bonâr, from bon "basis, root, origin, ground", from Mid.Pers. bun "base, root, origin;" Av. buna- "ground" (cf. Skt. budhna- "ground, bottom, depth", L. fundus "bottom", PIE base *bhud-/*bhund-) + âr short form of âvar present stem of âvardan "to cause or produce; to bring," → production; compare with Ger. die Ursache "cause," from ur- "primal" + die Sache "thing, matter." caustic   سوچان   sucânFr.: caustique   1) Capable of burning, corroding, or destroying living tissue. A caustic substance. 2) Optics: The enveloping surface formed by light rays reflecting or refracting from a curved surface. → caustic curve, → caustic surface.M.E., from O.Fr. caustique, from L. causticus "burning," from Gk. kaustikos "capable of burning," from kaust(os) "combustible," from kaiein "to burn" + -ikos, → -ic.Sucân, from suc- "to burn," variant of suz-, suzidan, suxtan "to burn;" cf. Baluci suc-, soc-; Mid.Pers. sôxtan, sôzidan "to burn;" Av. base saoc- "to burn, inflame" sūcā "brilliance," upa.suxta- "inflamed;" cf. Skt. śoc- "to light, glow, burn," śocati "burns," (caus.) socayati, śuc- "flame, glow," śoka- "light, flame;" PIE base *(s)keuk- "to shine." caustic curve   خم ِ سوچان   xam-e sucânFr.: courbe caustique   The intersection of a → caustic surface with a plane passing through the beam of rays.→ caustic; → curve. caustic surface   رویه‌ی ِ سوچان   ruye-ye sucânFr.: surface cuastique   In an → optical system, the → envelope of all the → reflected or → refracted rays (by a → mirror or a → lens respectively) which do not come to a common focal point because of geometrical → aberration. This occurs when parallel rays of light fall on a → concave mirror or when a → convex lens receives parallel light. In the case of → spherical aberration, the caustic surface has an axis of symmetry.→ caustic; → surface. causticity   سوچانی   sucâniFr.: causticité   The quality of being physically caustic.→ caustic; → -ity. cavity   کاواک   kâvâk (#)Fr.: cavité   1) An apparently hollow formation in the structure of an astronomical object, for example a sizable hole on the surface of a → molecular cloud created by → ultraviolet photons of a → massive star. 2) In a semiconductor laser, two reflective parallel edges forming a resonator that amplifies the light through stimulated emission.From M.Fr. cavité, from L.L. cavitas "hollowness," from L. cavus "hollow."Kâvâk, related to verb kâvidan (kâftan) "to dig; to examine, investigate," cf. L. cavus "hollow" (E. derivatives: cavity, concave, cave, excavate), Gk. koilos "hollow," Armenian sor, PIE *kowos "hollow." CCD   سی‌سی‌دی   si-si-di (#)Fr.: CCD   Short for → charge + coupled, from → couple, + → device. CCD array   آرست ِ سی‌سی‌دی   ârast-e sisidiFr.: détecteur CCD bidimensionnel   A CCD detector having two dimensions.→ CCD; → array. CCD detector   آشکارگر ِ سی‌سی‌دی   âškârgar-e sisidi (#)Fr.: détecteur CCD   → CCD; → detector. CCD frame   تک تصویر ِ سی سی دی   tak-tasvir-e sisidiFr.: image CCD   One of a series of astronomical images obtained using a CCD detector in particular for calibration purposes.→ CCD; → frame. CCD gain   بهره‌ی ِ سی‌سی‌دی   bahre-ye CCDFr.: gain de CCD   In a → CCD detector, the ratio of the initial number of electrons in a → pixel to the final number of → analog-to-digital units (or counts) reported by camera software. For example, a gain of 1.8 e-/count means that the camera produces 1 count for every 1.8 recorded electrons.→ charge-coupled device (CCD); → gain.