An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 1234

Fr.: catroptique   

The area of → optics which treats of the laws and properties of light reflected from reflective surfaces.

From Gk. katoptrikos, from katoptron "mirror" (from kat-, → cata-, + op- "to see," → optics, + -tron suffix of instruments) + -ikos, → -ics.

Bâztâbik, from bâztâb, → reflection, + -ik, → -ics.

Cauchy's equation
  هموگش ِ کوشی   
hamugeš-e Cauchy

Fr.: 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 + B2 + C4, where A, B, and C are constants characterizing the medium. The two-component Cauchy equation is n = A + B2, from which the dispersion becomes dn/dλ = -2B3 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 Cauchy

Fr.: 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).

Cauchy's equation; → theorem.

  بناری، بنارمند   
bonârmand, bonâri

Fr.: causal   

Of, involving, or constituting a cause; indicative of or expressing a cause.

Adj. from → cause.

causal structure
  ساختار ِ بنارمند   
sâxtâr-e bonârmand

Fr.: structure causale   

In → special relativity, the causal relationship between → events involving a → light cone.

causal; → structure.


Fr.: causalité   

The relationship between causes and effects

Causality, from → causal + -ity.

Bonârmandi, from bonârcause + -mand suffix denoting relation, affinity + -i noun forming suffix.

causality principle
  پروز ِ بنارمندی   
parvaz-e bonârmandi

Fr.: principe de causalité   

The principle that cause must always precede effect.

causality; → principle.


Fr.: 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.


Fr.: 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 (

Ultimately from L. causativus, → cause; → -ive.

  ۱) بنار؛ ۲) بناریدن   
1) bonâr; 2) bonâridan

Fr.: 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."


Fr.: 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 sucân

Fr.: 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 sucân

Fr.: 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.


Fr.: causticité   

The quality of being physically caustic.

caustic; → -ity.

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."

si-si-di (#)

Fr.: CCD   

charge-coupled device.

Short for → charge + coupled, from → couple, + → device.

CCD array
  آرست ِ سی‌سی‌دی   
ârast-e sisidi

Fr.: détecteur CCD bidimensionnel   

A CCD detector having two dimensions.

CCD; → array.

CCD detector
  آشکارگر ِ سی‌سی‌دی   
âškârgar-e sisidi (#)

Fr.: détecteur CCD   

charge-coupled device.

CCD; → detector.

CCD frame
  تک تصویر ِ سی سی دی   
tak-tasvir-e sisidi

Fr.: 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 CCD

Fr.: 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.

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