An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

<< < age cut ima Mag pro uns > >>

Number of Results: 105 Search : age
age
  ۱) سن؛ ۲) عصر   
1) senn (#); 2) asr (#)

Fr.: âge   

1) The length of time that a celestial body or an evolutionary stage of it has existed, i.e. the age of a massive star, the age of a galaxy, a stellar cluster, and so on.
2) a: A period of time in the history of the Universe marked by a distinctive characteristic. → cosmic dark age. b: A division of geologic time in the history of the Earth, usually shorter than an epoch.

From O.Fr. aage, from Vulgar L. *ætaticum, from L. ætatem "period of life," from ævum "lifetime, eternity, age;" cf. Mid.Pers. awâm, âwâm "time, season," Av. âyav- "duration, period, time of life," Skt. âyuh- "life, health". All from PIE *aiw-, *ayu- "vital force, life, long life, eternity."

Senn from Ar. senn "age, lifetime". Asr from Ar.

age of the Moon
  ۱) کهن‌روزی ِ ماه؛ ۲) سن ِ ماه   
1) kohan-ruzi-ye mâh; 2) senn-e mâh

Fr.: âge de la lune   

Same as → Moon's age.

Moon's age.

age of the Universe
  سن ِ گیتی   
senn-e giti

Fr.: âge de l'Univers   

The time elapsed since the → Big Bang.

age; → universe.

Agena (β Centauri)
  حضار   
Hazâr

Fr.: Agena   

Alternative name for the star Hadar, the second brightest star in Centaurus and the tenth brightest star in the sky. → Hadar.

The etymology of Agena is not clear. Some sources have suggested L. a genu "by the knee," but it seems dubious.

agent
  کنشگر   
konešgar (#)

Fr.: agent   

1) Something such as a chemical substance, organism, or natural force that causes an effect.
2) Somebody who provides a particular service for another.

From L. agentem (nominative agens, genitive agentis), pr.p. of agere "to set in motion, drive, lead, conduct," → act.

Konešgar, from koneš verbal noun of kardan "to do, to make" (Mid.Pers. kardan, O.Pers./Av. kar- "to do, make, build," Av. kərənaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make") + -gar, → -or.

ageostrophic wind
  باد ِ نازمین‌چرخشی   
bâd-e nâ-zamincarxeši

Fr.: vent agéostrophique   

Meteo.: The wind component deviating from the → geostrophic wind in the absence of the → geostrophic balance. In other words, ageostrophic wind is the difference between the true wind and the geostrophic wind.

From negation prefix → a- + → geostrophic; → wind.

Almagest
  مجسطی   
Majesti

Fr.: Almageste   

A comprehensive treatise, compiled by Claudius Ptolemy of Alexandria, around A.D. 140, that summarized the astronomy, geography, and mathematics of antiquity, and included a star catalogue with data for 1,022 stars.

Almagest, from Ar. Al-majisti, from al "the" + Gk. megiste (suntaxis) "the greatest (composition)," from femenine of megistos, superlative of megas "great."

analytic language
  زبان ِ آنالسی   
zabân-e ânâlasi

Fr.: langue analytique   

A language that is characterized largely by the fact that it depends on word order, rather than on inflections (grammatical endings), to convey sentence meanings. In an analytic language relations between nouns and adjectives are expressed using prepositions. English and (to a lesser extent) French, and Persian are considered analytic languages, while German and Russian are → synthetic languages.

analytic; → language.

artificial language
  زبان ِ ساختگی   
zabân-e sâxtegi

Fr.: langue artificielle   

An artificially created language system for international communication or for a specific intellectual or scientific purpose. Examples include Esperanto, computer programing languages, → symbolic logic, and → tensor analysis.

artificial; → language.

average
  میانگین   
miyângin (#)

Fr.: moyenne   

A number representing a group of quantities, obtained by adding each quantity of the group and dividing the total by the number of quantities. Same as → arithmetic mean.

From O.Fr. avarie "damage to ship," from It. avaria or maybe avere, O.Fr. aveir "property, goods," from L. habere "to have." Meaning shifted to "equal sharing of such loss by the interested parties."

Miyângin "the middle; middle-sized; the middle pearl in a string," from miyân, → middle, + -gin a suffix forming adjectives of possession.

average velocity
  تندای ِ میانگین   
tondâ-ye miyângin

Fr.: vitesse moyenne   

The ratio of the displacement (Δx) of a particle, as it moves from point A to point B, to the corresponding time interval: v = Δx/Δt.

average; → velocity.

bias voltage
  ولتاژ ِ ورک   
voltâž-e varak

Fr.: voltage de biais   

A voltage applied or developed between two electrodes as a bias.

bias; → voltage.

blurred image
  تصویر ِ تار، ~ ِ ناتیگ   
tasvir-e târ, ~ nâtig

Fr.: image estompée, ~ floue   

An image which is dim, indistinct, or vague in appearance, for instance when the optics is not well-focused or when the seeing is poor. The same as → unsharp image, contrary to → sharp image.

Blurred, p.p. of → blur; → image.

Bronze Age
  عصر ِ برنز   
asr-e boronz (#)

Fr.: âge du fer   

A period of time between the → Stone Age and the → Iron Age when bronze was used widely to make tools, weapons, and other implements. The Bronze Age starts at different areas of the world at different times. The earliest use of bronze for making farm tools and weapons are found in Near and Middle East and date back to about 3700 BC. The Bronze Age starts about 2300 BC in Europe.

bronze; → age.

cage
  قفس   
qafas (#)

Fr.: cage   

1) An enclosure, usually made with bars or wire, for keeping birds or wild animals.
2) An enclosed structure resembling a cage. → observer's cage, → Faraday cage.

M.E. from O.Fr. cage, from L. cavea "hollow place, enclosure for animals," cognate with Pers. kâv "hollow," → concave.

Qafas "cage," of unknown origin.

characteristic age
  سن ِ سرشتاری   
senn-e sereštâri

Fr.: âge caractéristique   

Of a pulsar, a normalized period of rotation assumed to be a good approximation to pulsar's true age.

characteristic; → age.

co-added image
  تصویر ِ هم‌افزوده   
tasvir-e hamafzudé

Fr.: image intégrée   

An image made up of several individual images of relatively short exposure times which are added together in order to produce a final image of higher quality.

Co-added, from → co- "together" + added p.p. of → add; → image.

Tasvir, → image; hamafzudé from ham- "together", → com-, + afzudé p.p. of afzudan, → add.

Copenhagen Interpretation
  آزند ِ کوپنهاگ   
âzand-e Kopenhâg

Fr.: interprétation de Copenhague   

A general heading which covers a wide variety of complex views on → quantum theory. As the first and the founding interpretation of the → quantum mechanics, it was developed in the late 1920's mainly by the Danish physicist Niels Bohr, but also Werner Heisenberg, Max Born and other physicists who made important contributions to the overall understanding of this field. Bohr expressed himself on the subject at various meetings and later published several articles and comments, but he never wrote a systematic and complete version of his views. There is not a unique Copenhagen Interpretation but various more or less complete versions, the common denominator of which is mainly the work of Bohr. Among those opposed to the Copenhagen Interpretation have been Albert Einstein, Erwin Schrödinger, Louis de Broglie, Max Planck, David Bohm, Alfred Landé, Karl Popper, and Bertrand Russell. The Copenhagen Interpretation recognizes that the deterministic picture of the universe that works so well at the macroscopic level does not work for the world at the quantum level. The universe at the quantum level is predictable only in a statistical sense. This implies that we can never really know the nature of quantum phenomena. The four cornerstones of the Copenhagen Interpretation are: → wave-particle duality, the probability → wave function, the → uncertainty principle, and the significance of the → observer. The observer is of the utmost importance because he causes the reality to unfold in the way it does. The key feature of the Copenhagen Interpretation is a concept known as the → collapse of the wave function, for which there is no known physical explanation; see also → Schrodinger's cat.

Copenhagen, from Dan. København "merchant's port," from køber "merchant" ("buyer") + havn "port," from the fact that the originator and chief interpreter of this school was Niels Bohr whose headquarters was in Copenhagen; → interpretation.

Cosmic Dark Age
  عصر ِ تاریک ِ کیهانی   
asr-e târik-e keyhâni

Fr.: âge sombre cosmique   

The period of time in the early history of the Universe, between the → recombination era and the advent of the → first stars.

cosmic; → dark; → age.

coverage
  پوشش   
pušeš (#)

Fr.: couverture   

1) General: The extent to which something is covered.
2) Astro.: The total area of the sky observed in a particular → sky survey. See also → fractional sky coverage.
3) The area within which a radio signal sent by a transmitter is received reliably .
4) In film making, the shooting of a scene from various views and using various exposures.

From → cover + -age a suffix forming abstract nouns.

cover.

<< < age cut ima Mag pro uns > >>