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: 13116 Search : far
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.

theorem
  فربین   
farbin

Fr.: théorème   

A → proposition, → statement, or → formula in → mathematics or → logic deduced from → axioms, other propositions, → assumptions, → premises, or formulas. Theorems are statements which can be proved. For example, → 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."

theoretical
  نگریک   
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.

theoretician
  نگره‌پرداز   
negare-pardâz

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.

theorist
  نگره‌پرداز   
negare-pardâz

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.

theoretician.

theory
  نگره   
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;

therm
  ترم   
therm

Fr.: therm   

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

From Gk. therme "heat," → thermal.

thermal
  گرمایی   
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."

thermal agitation
  ژیلش ِ گرمایی   
ſileš-e garmâyi

Fr.: agitation thermique   

1) The random movement of the molecules of a substance, the energy of which is, by kinetic theory, synonymous with the heat content of the substance.
2) Solid state physics: The random motion of free electrons in a conductor due to heat energy.

thermal; → agitation.

thermal bremsstrahlung
  لگام-تابش ِ گرمایی   
legâm-tâbeš-e garmâyi

Fr.: bremsstrahlung thermique   

The emission of electromagnetic radiation from high temperature plasma, produced as electrons are deviated by positive ions. Same as → free-free emission

thermal; → bremsstrahlung.

thermal conduction
  هازش ِ گرمایی   
hâzeš-s garmâyi

Fr.: conduction thermale   

A process that occurs in a medium where a → temperature gradient exists: dQ = -κ(dT/dx)dA.dt, where dQ is the amount of heat passing through the time dt across an area dA in the direction of the normal x to this area and toward the reduction in temperature, κ is the → thermal conductivity, and (dT/dx) the temperature gradient.

thermal; → conduction.

thermal conductivity
  هازندگی ِ گرمایی   
hâzandegi-ye garmâyi

Fr.: conductivité thermale   

In → thermal conduction, the amount of heat passing across unit area per unit time and per unit → temperature gradient.

thermal; → conductivity.

thermal detector
  آشکارگر ِ گرمایی   
âškârgar-e garmâyi

Fr.: détecteur thermique   

A detector that senses the change of temperature due to the absorption of photons.

thermal; → detector.

thermal diffusion
  پخش ِ گرمایی   
paxš-e garmâyi

Fr.: diffusion thermique   

A physical process resulting from → temperature gradients in stellar interiors, whereby more highly charged and more massive chemical species are concentrated toward the hottest region of the star, its center. Therefore, thermal diffusion and → gravitational settling tend to make heavier species sink relative to the light ones.

thermal; → diffusion.

thermal emission
  گسیل ِ گرمایی   
gosil-e garmâyi (#)

Fr.: émission thermique   

thermal radiation.

thermal; → emission.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 coo Cor Cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>