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.
The belief in one God as the creator and ruler of the universe, without rejection of
revelation (distinguished from → deism).
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.
A person who believes in → theism.
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).
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.
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."
A person versed in theology, especially Christian theology (Dictionary.com)
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).
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."
Of, pertaining to, or consisting in theory.
From L.L. theoreticus "of or pertaining to theory," from Gk. theoretikos "contemplative, pertaining to theory;" → theory.
axtarfizik-e negarik (#)
Fr.: astrophysique théorique
An astrophysical study or research group mainly concerned with theory rather than observation.
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.
Same as → theoretician.
From theor-, from → theory + -ist a suffix of nouns, often corresponding to verbs ending in -ize or nouns ending in -ism.
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)
negare-ye hamé ciz
Fr.: théorie du tout
theory of relativity
Fr.: théorie de la relativité
Any of several commercial units of heat energy, as one equivalent to 106 calories.
From Gk. therme "heat," → thermal.
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."
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.
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