Online Etymology Dictionary

outstay (v.): c. 1600, from out (adv.) + stay (v.).
outstretch (v.): mid-14c., from out + stretch (v.). Related: Outstretched; outstretching.
outstrip (v.): 1570s, "to pass in running," from out + Middle English strip "move quickly," of unknown origin. Figurative sense of "to excel or surpass in anything" is from 1590s. Related: Outstripped; outstripping.
outward (adj.): Old English utweard "toward the outside, external" (of an enclosure, surface, etc.), earlier utanweard, from ute, utan "outside" (from ut; see out) + -weard (see -ward). Of persons, in reference to the external appearance (usually opposed to inner feelings), it is attested from c. 1500. Also as an adverb in Old English (utaword). Outward-bound "directed on a course out from home port" is first recorded c. 1600; with capital initials, it refers to a sea school founded in 1941. Related: Outwardly; outwardness.
outweigh (v.): 1590s, from out (adv.) + weigh (v.). Related: Outweighed; outweighing.
outwit (v.): "to get the better of by superior wits," 1650s, from out + wit. Related: Outwitted; outwitting.
outworn (adj.): from out (adv.) + worn.
ouzel (n.): also ousel, from Old English osle "blackbird," from West Germanic *amslon- (source also of Old High German amsala, German amsel), probably from PIE *ams- "black, blackbird" (source also of Latin merula "blackbird," Welsh mwyalch "blackbird, thrush," Breton moualch "ouzel").
ouzo (n.): liquor flavored with aniseed, 1898, from Modern Greek ouzo, of uncertain origin. One theory [OED] is that it derives from Italian uso Massalia, literally "for Marsailles," which was stamped on selected packages of silkworm cocoons being shipped from Thessaly, and came to be taken for "of superior quality."
oval (adj.): 1570s, from Modern Latin ovalis "egg-shaped" (source of French oval, 1540s), literally "of or pertaining to an egg," from Latin ovum "egg" (see ovary). The classical Latin word was ovatus.
oval (n.): 1560s, from Middle French ovalle "oval figure," from Medieval Latin ovalis (see oval (adj.)).
Ovaltine: proprietary name of a drink mix, 1906, probably based on Latin ovum (see oval), because eggs are one of the ingredients.
ovarian (adj.): "pertaining to an ovary or the ovaries," 1810, see ovary + -ian.
ovary (n.): 1650s, from Modern Latin ovarium "ovary" (16c.), from Medieval Latin ovaria "the ovary of a bird" (13c.), from Latin ovum "egg," from PIE *owyo-/*oyyo- "egg" (see egg (n.)). In classical Latin, ovarius meant "egg-keeper."
ovate (n.): 1723, from assumed Latin plural Ovates, from Greek Ouateis "soothsayers, prophets," mentioned by Strabo as a third order in the Gaulish hierarchy, from Proto-Celtic *vateis, plural of *vatis, cognate with Latin vatis, Old Irish faith, Welsh ofydd. The modern word, and the artificial senses attached to it, are from the 18c. Celtic revival and the word appears first in Henry Rowlands.
ovate (adj.): 1760, from Latin ovatus "egg-shaped," from ovum "egg" (see ovum).
ovation (n.): 1530s, in the Roman historical sense, from Middle French ovation or directly from Latin ovationem (nominative ovatio) "a triumph, rejoicing," noun of action from past participle stem of ovare "exult, rejoice, triumph," probably imitative of a shout (compare Greek euazein "to utter cries of joy"). In Roman history, a lesser triumph, granted to a commander for achievements insufficient to entitle him to a triumph proper. Figurative sense of "burst of enthusiastic applause from a crowd" is first attested 1831.
oven (n.): Old English ofen "furnace, oven," from Proto-Germanic *ukhnaz (source also of Old Frisian, Dutch oven, Old High German ovan, German Ofen, Old Norse ofn, Old Swedish oghn, Gothic auhns), from PIE *aukw- "cooking pot" (source also of Sanskrit ukhah "pot, cooking pot," Latin aulla "pot," Greek ipnos), originally, perhaps, "something hollowed out." The oven-bird (1825) so called because of the shape of its nest. In slang, of a woman, to have (something) in the oven "to be pregnant" is attested from 1962.
over (prep.): Old English ofer "beyond, above, upon, in, across, past; on high," from Proto-Germanic *uberi (source also of Old Saxon obar, Old Frisian over, Old Norse yfir, Old High German ubar, German über, Gothic ufar "over, above"), from PIE *uper (see super-). As an adjective from Old English uffera. As an adverb from late Old English. Sense of "finished" is attested from late 14c. Meaning "recovered from" is from 1929. In radio communication, used to indicate the speaker has finished speaking (1926). Adjective phrase over-the-counter is attested from 1875, originally of stocks and shares.
over-: word-forming element meaning "above; highest; across; too much; above normal; outer," from Old English ofer (see over). Over and its Germanic relations were widely used as prefixes, and sometimes could be used with negative force. This is rare in Modern English, but compare Gothic ufarmunnon "to forget," ufar-swaran "to swear falsely;" Old English ofercræft "fraud."
over-abundance (n.): late 14c., from over- + abundance.
over-abundant (adj.): c. 1400, from over- + abundant.
over-achiever (n.): also overachiever, 1953, from over- + agent noun of achieve (v.). Related: Over-achieve; over-achieving.
over-age (adj.): 1886, from over- + age (n.). Related: Over-aged "those who are too old" (late 15c.).
over-anxious (adj.): 1713, from over- + anxious. Related: Overanxiously; overanxiousness.
over-cautious (adj.): 1706, from over- + cautious. Related: Over-cautiously; over-cautiousness.
over-compensate (v.): 1758 (implied in over-compensated), from over- + compensate. Related: Over-compensating.
over-compensation (n.): 1917 in the psychological sense, translating German überkompensation, from over- + compensation. A term used by A. Alder to denote exaggerated striving for power in someone who has an inner sense of inferiority.
over-confidence (n.): c. 1700, from over- + confidence.
over-confident (adj.): 1610s, from over- + confident. Related: Overconfidently.
over-correction (n.): 1828, from over- + correction.
over-educated (adj.): 1788, from over- + educated.
over-estimate (v.): 1768, from over- + estimate (v.). Related: Over-estimated; over-estimating.
over-estimation (n.): 1793, noun of action from over-estimate (v.).
over-excite (v.): 1708 (implied in over-excited), from over- + excite. Related: Over-exciting.
over-excitement (n.): 1815, from over- + excitement.
over-expose (v.): 1869, in photography, from over- + expose (v.). Figurative sense, in reference to celebrity, first attested 1969 (implied in overexposure). Related: Over-exposed; over-exposing.
over-extend (v.): "to take on too much" (work, debt, etc.), 1937, from over- + extend. Related: Over-extended; over-extending.
over-indulge (v.): 1741, from over- + indulge. Related: Over-indulged; over-indulging.
over-indulgence (n.): also overindulgence, 1630s, from over- + indulgence. First attested in Donne.
over-long (adv.): "for too long a time," late 14c., from over- + long (adj.).
over-populate (v.): also overpopulate, "to overrun with too many people," 1828 (implied in overpopulated), from over- + populate (v.). Related: Overpopulating. Over-populous "over-populated" is attested from 1670s.
over-population (n.): "over-populousness," 1807, from over- + population. Malthus (1798) had over-populousness.
over-react (v.): also overreact, 1961, from over- + react (v.). First attested in Lewis Mumford. Related: Over-reacting; overreacting; over-reaction.
over-ripe (adj.): 1670s, from over- + ripe (adj.).
over-sexed (adj.): 1898, from over- + past participle of sex (v.).
over-stuffed (adj.): also overstuffed, of furniture, "completely covered with a thick layer of stuffing," 1883, from over- + past participle of stuff (v.).
over-trouble (v.): 1580s, from over- + trouble (v.). Related: Over-troubled; over-troubling.
over-use (v.): 1670s, from over- + use (v.). Related: Overused; overusing.
over-wind (v.): also overwind, "wind too tight," c. 1600, from over- + wind (v.1). Related: Over-wound; over-winding.