An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 573
Talasâ (#)

Fr.: Thalassa   

The second innermost satellite of → Neptune. It was discovered using NASA's Voyager 2 mission in 1989. It orbits 50,070 km from the center of Neptune and is about 80 km in diameter.

Named after a daughter of Aether and Hemera from Gk. mythology. Thalassa is also the Greek word for "sea".

Tebé (#)

Fr.: Thébé   

The fourth-closest of → Jupiter's known → satellites, also known as Jupiter XIV. Thebe is 100 x 90 km in diameter and orbits its planet at 222,000 km in 0.6745 (Earth) day. It is in synchronous rotation, i.e. always keeps the same side facing Jupiter. Thebe was discovered by Stephen Synnott (Voyager 1) in 1979.

In Gk. mythology, Thebe was a nymph, daughter of the river god Asopus.


Fr.: Théia   

A hypothetical → protoplanet that collided with → earth some 4.5 billion years ago. Debris from the collision, a mixture of material from both bodies, spun out into Earth orbit and → coalesced into the → Moon. This scenario explains many aspects of → lunar geology including the size of the Moon's → core and the → density and → isotopic  → composition of Moon rocks.

Named for Theia, the mythical Greek Titan who was the mother of Selene, the goddess of the Moon.

yazdân-bâvari (#)

Fr.: théisme   

The belief in one God as the creator and ruler of the universe, without rejection of revelation (distinguished from → deism).
2) Belief in the existence of a god or gods (opposed to → atheism) (

From the- variant of theo- before a vowel, from Gk. theos "god," from PIE root *dhes-, root of words applied to various religious concepts, such as L. feriae "holidays," festus "festive," fanum "temple."

Yzadân-bâvari, from yazdân "god," from Mid.Pers. yazetân "gods," ultimately from Proto-Ir. *iaz- "to sacrifice, worship, venerate," → deity.

yazdân-bâvar (#)

Fr.: théiste   

A person who believes in → theism.

theism; → -ist


Fr.: Thémisto   

A small satellite of → Jupiter, ninth in order from the planet. It is about 8 km in diameter and orbits Jupiter at a mean distance of 7 500 000 km every 130 days. It was discovered in 1975, lost, and then rediscovered in 2000. Also known as Jupiter XVIII.

Named after Themisto, daughter of the river god Inachus, who became the mother of Ister (the river Danube) by Zeus (Jupiter).

yazdân-sâlâri (#)

Fr.: théocratie   

1) A form of government in which → God or a → deity is recognized as the supreme civil ruler, the God's or deity's laws being interpreted by the ecclesiastical authorities.
2) A system of government by priests claiming a divine commission (

theism; → -cracy.

teodolit (#)

Fr.: théodolite   

An instrument for the measurement of angles, used in surveying. It consists essentially of a telescope moving along a circular scale graduated in degrees.

The first occurrence of the word theodolite is found in the surveying textbook A geometric practice named Pantometria (1571) by Leonard Digges, which was published posthumously by his son, Thomas Digges. The etymology of the word is unknown. The first part of the New Latin theo-delitus might stem from the Gk. theaomai "to behold, view attentively, contemplate," but the second part is more puzzling and is often attributed to an un-scholarly variation of delos "evident, clear."

yazdân-šenâs (#)

Fr.: théologien   

A person versed in theology, especially Christian theology (


yazdân-šenâsi (#)

Fr.: théologie   

The field of study and analysis that treats of → God and of God's attributes and relations to the universe; study of divine things or religious truth; divinity (

theism; → -logy.


Fr.: théorème   

A → proposition, → statement, or → formula in → mathematics or → logic deduced or to be deduced from other propositions, → assumptions, → premises, or formulas; e.g. → Fourier theorem; → Liouville's theorem; → Woltjer's theorem.

From M.Fr. théorème, from L.L. theorema, from Gk. theorema "spectacle, speculation," in Euclid "proposition to be proved," from theorein "to look at, speculate, consider."

Farbin, from far- intensive prefix "much, abundant; elegantly; forward" (Mid.Pers. fra- "forward, before; much; around;" O.Pers. fra- "forward, forth;" Av. frā, fərā-, fra- "forward, forth; excessive;" cf. Skt. prá- "before; forward, in front;" Gk. pro "before, in front of;" L. pro "on behalf of, in place of, before, for;" PIE *pro-) + bin, present stem of didan "to see," from Mid.Pers. wyn-; O.Pers. vain- "to see;" Av. vaēn- "to see;" cf. Skt. veda "I know;" Gk. oida "I know," idein "to see;" L. videre "to see;" PIE base *weid- "to know, to see."

negarik (#)

Fr.: théorique   

Of, pertaining to, or consisting in theory.

From L.L. theoreticus "of or pertaining to theory," from Gk. theoretikos "contemplative, pertaining to theory;" → theory.

Negarik, contraction of negaréik, from negarétheory + -ik, → -ic.

theoretical astrophysics
  اخترفیزیک ِ نگریک   
axtarfizik-e negarik (#)

Fr.: astrophysique théorique   

An astrophysical study or research group mainly concerned with theory rather than observation.

theoretical; → astrophysics.


Fr.: théoricien   

One who formulates or is expert in the theoretical side of a subject.

From theoretic, from theoretics, from → theory + -ian.

Negare-pardâz, from negaré, → theory, + pardâz, present stem of pardâxtan "to accomplish; bring to perfection; to attempt, to care; to clean; to free;" Mid.Pers. pardâxtan, pardâzidan "to accomplish; to be done with, freed of" ultimately from Proto-Iranian *para-tāxta-, *para-tāca- "to take away; to expel," from *para- "along, forth," → para-, + tāxta-, tāca- "to run, to flow;" cf. Av. tak- "to run, to flow;" Mod.Pers. tâxtan, tâz- "to flow, to cause to walk," → flow.


Fr.: théoricien   

Same as → theoretician.

From theor-, from → theory + -ist a suffix of nouns, often corresponding to verbs ending in -ize or nouns ending in -ism.


negaré (#)

Fr.: théorie   

A coherent set of verified facts, propositions, or principles analyzed in their relation to one another and used to explain and predict phenomena, e.g. the → theory of relativity. The criterion of the scientific status of a theory is its → falsifiability, → refutability, or → testability. See also → hypothesis, → model.

From L.L. theoria, from Gk. theoria "contemplation, speculation, a looking at, things looked at," from theorein "to consider, view, look at," from theoros "spectator," from thea "a view" + horan "to see."

Negaré, from negar present stem of negaridan, negaristan "to look, observe;" Mid.Pers. nigeridan, niger-, nikiritan, nikir- "to look, to watch, to notice, to consider;" ultimately from Proto-Iranian *ni-kar-, from *ni- "down, in, into," → ni- (PIE), + *kar- "to observe, to consider;" cf. Av. kar- "to remember; to impress on memory;" Skt. kal- "to observe, consider," kalayati "considers, observes;" Mid.Pers. kartan "to establish; to declare; to found," (h)angârtan "to consider, to bear in mind, to regard as," us-kâritan "to consider, deliberate, discuss," sikâl, sigâl "thought;" Mod.Pers. engâridan, engâštan "to suppose," segâl "thought," segâlidan "to think, to resolve to injure, to deceive."

theory of everything (TOE)
  نگره‌ی ِ همه چیز   
negare-ye hamé ciz

Fr.: théorie du tout   

Any theory that attempts to describe all the forces of nature including gravity in a single mathematical formalism; e.g. → grand unified theory. → string theory.

theory; every; M.E. every, everich; O.E. æfre ælc "ever each;" → thing.

Negaré, → theory; hamé, → all; ciz, → thing.

theory of relativity
  نگره‌ی ِ بازانیگی   
negare-ye bâzânigi

Fr.: théorie de la relativité   

Any of the two theories put forward by Albert Einstein: → special relativity (1905) and → general relativity (1916).

theory; → relativity;


Fr.: therm   

Any of several commercial units of heat energy, as one equivalent to 106 calories.

From Gk. therme "heat," → thermal.

garmâ-yi (#)

Fr.: thermique   

Of, pertaining to, or caused by heat or temperature.

From M.Fr. thermal, from Gk. therme "heat," cognate with Pers. garm "warm," as below.

Garmâyi, adj. of garmâ "heat, warmth," from Mid.Pers. garmâg; O.Pers./Av. garəma- "hot, warm;" cf. Skt. gharmah "heat;" cognate with Gk. therme, thermos, as above; PIE *ghworm-/*ghwerm- "warm."

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