An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13048 Search : far
test time
  زمان ِ آزمون   
zamân-e âzmun

Fr.: temps de test   

That part of the working time of a telescope devoted to tests of coupled instruments or the telescope itself.

test; → time.

testability
  آزمون‌پذیری   
âzmunpaziri (#)

Fr.: testabilité   

The state or fact of being → testable. See also → falsifiability.

testable; → -ity.

testable
  آزمون‌پذیر   
âzmunpazir (#)

Fr.: testable   

The quality of a claim, hypothesis, or theory that can be verified by tests or experiments. See also → falsifiable.

test; → -able.

Tethys
  تتوس   
Tetus (#)

Fr.: Téthys   

The ninth of Saturn's known satellites. It it 1060 km across and orbits at a mean distance of 294,660 km from Saturn. It has a rotational period of 1.89 days that equals its orbital period. Tethys is thought to be composed almost entirely of water-ice because of its low density (1.21 gm/cm3). The western hemisphere of Tethys is dominated by a huge impact crater called Odysseus, whose 400 km diameter is nearly 2/5 of that of Tethys itself. Tethys has two moons named Telesto and Calypso. It was discovered by J.-D. Cassini in 1684.

In Gk. mythology Tethys was a Titaness and sea goddess who was both sister and wife of Oceanus.

tetra-
  چهار-   
cahâr- (#)

Fr.: tétra-   

Combining form meaning four.

From Gk. tetra-, combining form of tettares, tessares "four," cognate with Pers. cahâr, → four.

tetrad
  چهارگان   
cahârgân

Fr.: tétrade   

1) A group of four.
2) A sequence of four → total lunar eclipses occurring at approximately six month intervals. Tetrads are relatively rare events. The first → total eclipse of a tetrad occurred on 15 April 2014, the next eclipse of the series will happen on 8 October 2014 and the next two eclipses on 4 April and 28 September 2015, respectively. The previous tetrad happened in 2003-2004 and the next one will be in 2032-2033.

From Gk. tetrad-, stem of tetras "group of four."

Cahârgân, from cahâr, → four, + -gân suffix of plurality.

tetragon
  چهارگوش   
cahârguš (#)

Fr.: tétragone   

Same as → quadrangle.

From Gk. tetragonon, from → tetra- + -gon "angled, angular," from gonia "angle," related to gony "knee;" L. genu "knee;" Mod.Pers. zânu "knee;" Av. žnav-, žnu- "knee;" Skt. janu-; PIE base *g(e)neu-.

Cahârguš "four-cornered," from cahâr, câr "four," cognate with L. quattuor, → four, + gušé, guš "corner, angle;" Mid.Pers. gôšak "corner."

tetrahedron
  چهاردیمه   
cahârdimé

Fr.: tétraèdre   

A solid figure having four plane faces.

tetra-; → -hedron.

text
  بافه   
bâfé

Fr.: texte   

1) The main body of matter in a manuscript, book, newspaper, etc., as distinguished from notes, appendixes, headings, illustrations, etc.
2) The actual wording of anything written or printed.
3) Any of the various forms in which a writing exists (Dictionary.com).

M.E., from L. textus "text, terms, structure," originally, "pattern of weaving," → texture, from texere "to weave."

Bâfé, from bâftan "to weave," → texture.

texture
  بافت   
bâft (#)

Fr.: texture   

A type of hypothetical → topological defect in the structure of → space-time that forms when large, complicated symmetry groups are completely broken.

M.E., from M.Fr., from L. textura "web, texture, structure," from stem of textere "to weave;" PIE base *tek- "to make" → technique.

Bâft, verbal noun, past stem of bâftan "to weave;" Mid.Pers. waf- "to weave;" Av. ubdaēna- "consisting of woven texture," from *ubda- "woven," p.p. from vaf- "to weave; to sing," literally "to weave the songs;" cf. Skt. vabh- "to bind, fetter," ubhnāti "he laces together;" Gk. hyphainein "to weave," hyphos "web;" P.Gmc. *webanan (cf. O.N. vefa, M.L.G., M.Du., Du. weven, O.H.G. weban, Ger. weben; O.E. wefan; E. weave), from PIE *webh-/*wobh- "to weave."

Thalassa
  تلسا   
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".

Thebe
  تبه   
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.

Theia
  ته‌یا   
Teyâ

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.

theism
  یزدان‌باوری   
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) (Dictionary.com).

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.

theist
  یزدان‌باور   
yazdân-bâvar (#)

Fr.: théiste   

A person who believes in → theism.

theism; → -ist

Themisto
  تمیستو   
Themisto

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).

theocracy
  یزدان‌سالاری   
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 (Dictionary.com)

theism; → -cracy.

theodolite
  تءودولیت   
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."

theologian
  یزدان‌شناس   
yazdân-šenâs (#)

Fr.: théologien   

A person versed in theology, especially Christian theology (Dictionary.com)

theology.

theology
  یزدان‌شناسی   
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 (Dictionary.com).

theism; → -logy.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu Coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima Ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad ran rar ray rea rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>