英语词源字典 - 在线词源网站

theorem (n.)[theorem 词源字典]: 1550s, from Middle French théorème (16c.) and directly from Late Latin theorema, from Greek theorema "spectacle, sight," in Euclid "proposition to be proved," literally "that which is looked at," from theorein "to look at, behold" (see theory).[theorem etymology, theorem origin, 英语词源]
theoretical (adj.): 1610s, "contemplative," with -al (1) + Late Latin theoreticus "of or pertaining to theory," from Greek theoretikos "contemplative, speculative, pertaining to theory" (by Aristotle contrasted to praktikos), from theoretos "that may be seen or considered," from theorein "to consider, look at" (see theory). Meaning "pertaining to theory, making deductions from theory not from fact" (opposed to practical) is from 1650s; earlier in this sense was theorical (c. 1500). Meaning "ideal, hypothetical" is from 1790s (implied in theoretically). Related: theoretician.
theorist (n.): "one given to theory and speculation," 1590s; see theory + -ist.
theorize (v.): 1630s, perhaps a formation in English from theory + -ize. Related: Theorized; theorizing.
theory (n.): 1590s, "conception, mental scheme," from Late Latin theoria (Jerome), from Greek theoria "contemplation, speculation; a looking at, viewing; a sight, show, spectacle, things looked at," from theorein "to consider, speculate, look at," from theoros "spectator," from thea "a view" (see theater) + horan "to see," possibly from PIE root *wer- (4) "to perceive" (see ward (n.)).

Earlier in this sense was theorical (n.), late 15c. Sense of "principles or methods of a science or art" (rather than its practice) is first recorded 1610s (as in music theory, which is the science of musical composition, apart from practice or performance). Sense of "an intelligible explanation based on observation and reasoning" is from 1630s.
theosophy (n.): 1640s (implied in theosophical), "knowledge of divine things obtained through mystic study," from Medieval Latin theosophia (c.880), from Late Greek theosophia (c.500) "wisdom concerning God or things divine," from Greek theosophos "one wise about God," from theos "god" (see theo-) + sophia "skill, knowledge of, acquaintance with; philosophy," from sophos "wise, learned" (see sophist).

Applied variously over the years, including to the followers of Swedenborg. Taken as the name of a modern philosophical system (sometimes called Esoteric Buddhism), founded in New York 1875 as "Theosophical Society" by Madame Blavatsky and others, which has elements of Hinduism and Buddhism and claims supernatural knowledge of the divinity and his words deeper than that obtained from empiricism. Related: Theosophist.
ther-: often thero-, word-forming element meaning "beast," from comb. form of Greek ther "wild beast, beast of prey," from PIE *ghwer- "wild beast" (cognates: Latin ferus "wild," ferox "fierce;" see fierce). Also therio-, from Greek therion.
therapeutic (adj.): pertaining to the healing of disease, 1640s, from Modern Latin therapeuticus "curing, healing," from Greek therapeutikos, from therapeutein "to cure, treat medically," primarily "do service, take care of, provide for," of unknown origin, related to therapon "attendant." Therapeutic was used from 1540s as a noun meaning "the branch of medicine concerned with treatment of disease." Related: Therapeutical (c. 1600).
therapist (n.): 1880, from therapy + -ist; earlier was therapeutist (1816). Especially of psychotherapy practitioners from c. 1930s.
therapy (n.): 1846, "medical treatment of disease," from Modern Latin therapia, from Greek therapeia "curing, healing, service done to the sick; a waiting on, service," from therapeuein "to cure, treat medically," literally "attend, do service, take care of" (see therapeutic).
there (adv., conj.): Old English þær "in or at that place, so far as, provided that, in that respect," from Proto-Germanic *thær (cognates: Old Saxon thar, Old Frisian ther, Middle Low German dar, Middle Dutch daer, Dutch daar, Old High German dar, German da, Gothic þar, Old Norse þar), from PIE *tar- "there" (cognates: Sanskrit tar-hi "then"), from root *to- (see the) + adverbial suffix -r.

Interjectional use is recorded from 1530s, used variously to emphasize certainty, encouragement, or consolation. To have been there "had previous experience of some activity" is recorded from 1877.
thereabouts (adv.): early 15c., "in that area, around there; mid-15c., "near to that time, approximately thence," from Old English þær onbutan "about that place" + adverbial genitive -es; see there + about.
thereafter (adv.): Old English þær æfter; see there + after. Similar formation in Dutch daarachter, Swedish derefter.
thereby (adv.): Old English þærbig "thus, by means of or because of that;" see there + by. Similar formation in Old Frisian therbi, Middle Low German darbi, German dabei, Dutch daarbij.
therefor (adv.): "for this, for that," Middle English variant spelling of therefore (q.v.); in modern use perhaps perceived as there + for.
therefore (adv.): Old English þærfore; from there + fore, Old English and Middle English collateral form of for. Since c. 1800, therefor has been used in sense of "for that, by reason of that;" and therefore in sense of "in consequence of that." Similar formation in Dutch daarfoor, German dafür, Danish derfor.
therefrom (adv.): mid-13c., there from. One word from 17c.; see there + from.
therein (adv.): "in that place, time, or thing," Old English þærin; see there + in. Similar formation in German darin.
theremin (n.): 1927, from the name of its inventor, Russian engineer Léon Thérémin (1896-1993).
thereof (adv.): "of that, of it," Old English þærof; see there + of. Similar formation in Swedish, Danish deraf.