An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 620
azdâyidan (#)

Fr.: informer   

1) To impart → knowledge of a fact or circumstance.
2) To supply (oneself) with knowledge of a matter or subject (
3) To convey → information.
See also: → informatics, → information theory.

Inform, from M.E. informen, from O.Fr. enformer, from L. informare "to shape, form; to form an idea of," from → in- "into" + → forma "form."

Azdâyidan, from Mid.Pers. azdênidan "to inform," from azd "information, proclamation; known" (loaned into Arm. azd), from O.Pers. azdā "known," azdā kar "to become known;" Av. azdā "known;" Sogdian 'zd' "informed, known;" cf. Skt. addhā' "manifestly; certainly, truly," addhāti "sage."


Fr.: informateur   

A person who gives → information.

From → inform + -ant a suffix forming adjectives and nouns from verbs.

azdâyik (#)

Fr.: informatique   

The science concerned with gathering, manipulating, storing, retrieving, and classifying recorded → information. Also called → information science, computer science.

Informatics, from informat(ion), → information + → ics.

azdâyeš (#)

Fr.: information   

1) Knowledge gained through study, communication, research, instruction, etc.
2) Knowledge communicated or received concerning a particular fact or circumstance; news.
3) The act or fact of informing.
4) A sequence of signals that conveys a message to a receiver. Information does not exist on its own. It is contained within something and is coded. The notion of information involves → uncertainty and → randomness; hence the necessity for calling on → probability theory and → statistics.
See also: → information content, → information entropy, → information flow, → information paradox, → information science, → information technology, → information theory, → infosphere, → quantum information, → entropy.

Verbal noun of → inform.

information content
  پربنه‌ی ِ ازدایش   
parbane-ye azdâyeš

Fr.: contenu d'information   

The → negative of the → logarithm of the → probability that a particular → message or → symbol will be emitted by a → source.

information; → content.

information entropy
  درگاشت ِ ازدایش   
dargâšt-e azdâyeš

Fr.: entropie de l'information   

The measure of information, which is usually expressed by the average number of bits needed for storage or communication. In other words, the degree to which the values of a → random variable X are dispersed. If the → probability density function of X is P(x), the entropy is defined by: H(X) = -Σ P(x) log P(x). Also called → Shannon entropy.

information; → entropy.

information flow
  تچان ِ ازدایش   
tacân-e azdâyeš

Fr.: flot d'information   

The flow of data into a system or to the end users.

information; → flow.

information paradox
  پارادخش ِ ازدایش   
pârâdaxš-e azdâyeš

Fr.: paradoxe de l'information   

A paradox raised in 1976 by S. Hawking (1942-2018) whose analysis of the thermodynamic properties of → black holes led him to the prediction that black holes are not in fact black, but radiate due to quantum effects. This implied that, due to the → Hawking radiation, a black hole would eventually evaporate away, leaving nothing. This deduction presented a problem for → quantum mechanics, which maintains that information can never be lost. This topic is a matter of intense debate. Many solutions have been proposed, but all of them have serious drawbacks. In order to analyze better these solutions one needs a quantum gravity theory, which does not exist at the moment. In brief, either the idea of → quantum unitarity must be given up, or a mechanism should be found by which information is not lost after it falls into a black hole.

information; → paradox.

information science
  دانش ِ ازدایش، ازداییک   
dâneš-e azdâyeš azdâyik (#)

Fr.: informatique   

Same as → informatics.

information; → science.

information technology
  تشنیک‌شناسی ِ ازدایش   
tašnik-šenâsi-ye azdâyeš

Fr.: technologie de l'informtion   

The science and activity of receiving, storing, processing, and transmitting information by using → computers.

information; → technology.

information theory
  نگره‌ی ِ ازدایش   
negare-ye azdâyeš (#)

Fr.: théorie de l'information   

The mathematical theory that defines, quantifies, and analyzes the concept of → information. It involves → probability theory in → transmission of → messages when the → bits of information are subject to various distortions. Its goal is to enable as much information as possible to be reliably stored on a medium, retrieved, or communicated.
See also:
information content, → information entropy, → information flow, → information paradox, → information science, → information theory, → quantum information, → entropy.

information; → theory.


Fr.: informatif   

Giving → information, providing information, imparting → knowledge.

From informat-, from L. informatus, from → inform + → -ive.


Fr.: informateur   

A person who provides → information.

From → inform + -er, → -or.


Fr.: infosphère   

The global network of all the world's communications, databases, and sources of information.

information; → sphere.



A prefix meaning "below," used with second elements of any origin. → infrared; → infrasound.

From L. infra "below, underneath, beneath," from PIE *ndher; cf. Mod.Pers. zir "below, down," akin to → under-.

Foru-, from foru "down, downward; below; under, beneath; low," from Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain."

forusorx (#)

Fr.: infrarouge   

The invisible part of electromagnetic spectrum possessing wavelengths between those of visible light and those of radio waves, i.e. approximately between about 0.75 and 1000 μm.

From L. infra (adv., prep.) "below, underneath, beneath," inferus "lower," from PIE *ndher; cf. Av. aδara- (adj.), aδairi- (prep.) "below;" Mid.Pers. êr "below, down; low, under," adar "low," azêr "below, under" (Mod.Pers. zir "below, down"); Skt. ádhara- "lower;" O.E. under "under, among"); → red.

Forusorx, from foru "down, downward; below; beneath;" Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain," + sorxred.

infrared array
  آرست ِ فروسرخ   
ârast-e forusorx

Fr.: détecteur mosaïque infrarouge   

A two-dimensional infrared imaging device, consisting of an array of small, individual electronic detectors, each of which records a pixel in the image.

infrared; → array.

Infrared Astronomical Satellite (IRAS)
  ماهواره‌ی ِ اخترشناختی ِ فروسرخ   
mâhvâre-ye axtaršenâxti-e forusorx (#)

Fr.: satellite astronomique infrarouge   

An orbiting infrared telescope (60 cm mirror) which successfully operated from launch in January 1983 until the supply of coolant ran out in November 1983. It was a collaborative mission between NASA, the Netherlands, and the UK, and mapped 95% of the whole sky in the wavelength bands 12, 25, 60, and 100 microns.

infrared; → astronomical; → satellite.

infrared astronomy
  اخترشناسی ِ فروسرخ   
axtaršenâsi-ye forusorx (#)

Fr.: astronomie infrarouge   

The study of infrared properties of astronomical objects.

infrared; → astronomy.

infrared camera
  کدک ِ فروسرخ   
kadak-e forusorx

Fr.: caméra infrarouge   

An optical camera equipped with a → detector which is sensitive to → infrared radiation.

infrared; → camera.

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