英语词源字典 - 在线词源网站

Oz [Oz 词源字典]: mythical land in L. Frank Baum's "The Wonderful Wizard of Oz" (1900) and sequels; according to an anecdote written by Baum in 1903, inspired by a three-drawer desktop cabinet letter file, the last drawer labeled O-Z. As Australian slang for "Australia," attested by 1983.[Oz etymology, Oz origin, 英语词源]
oz.: abbreviation of ounce (n.1), 1540s, from Italian oz. (15c.), abbreviation of onza.
Ozark: mountains of southcentral United States, said to be from French aux Arcs, short for aux Arkansas "to the Arkansas (Indians)," who once inhabited that region. See Arkansas.
Ozarks: see Ozark.
ozone (n.): 1840, from German Ozon, coined in 1840 by German chemist Christian Friedrich Schönbein (1799-1868) from Greek ozon, neuter present participle of ozein "to smell" (see odor). So called for its pungent odor.
oxytocin: "A hormone released by the pituitary gland that causes increased contraction of the womb during labour and stimulates the ejection of milk into the ducts of the breasts", 1920s: from Greek oxutokia 'sudden delivery' (from oxus 'sharp' + tokos 'childbirth') + -in¹.
ogdoad: "A group or set of eight", Early 17th century: via late Latin from Greek ogdoas, ogdoad-, from ogdoos 'eighth', from oktō 'eight'.
omasum: "The muscular third stomach of a ruminant animal, between the reticulum and the abomasum", Early 18th century: from Latin, literally 'bullock's tripe'.
oedema: "A condition characterized by an excess of watery fluid collecting in the cavities or tissues of the body", Late Middle English: modern Latin, from Greek oidēma, from oidein 'to swell'.
omentum: "A fold of peritoneum connecting the stomach with other abdominal organs", Late Middle English: from Latin.
olivary: "Relating to or denoting the nucleus situated in the olive of the medulla oblongata in the brain", Late Middle English: from Latin olivarius 'relating to olives', from oliva (see olive).
orectic: "Of or concerning desire or appetite", Late 17th century (as a noun in the sense 'stimulant for the appetite'): from Greek orektikos, from oregein 'stretch out, reach for'. The current sense dates from the late 18th century.
ostiole: "(In some small algae and fungi) a small pore through which spores are discharged", Mid 19th century: from Latin ostiolum, diminutive of ostium 'opening'.
olivette: "A small oval weight threaded on a fishing line", Early 19th century (in the sense 'an oval button or bead').
orthosis: "A brace, splint, or other artificial external device serving to support the limbs or spine or to prevent or assist relative movement", 1950s: from Greek orthōsis 'making straight', from orthoun 'set straight'.
octennial: "Recurring every eight years", Mid 17th century: from late Latin octennium 'period of eight years' + -al.
olecranon: "A bony prominence at the elbow, on the upper end of the ulna", Early 18th century: from Greek ōle(no)kranon, from ōlenē 'elbow' + kranion 'head'.
osteoclast: "A large multinucleate bone cell which absorbs bone tissue during growth and healing", Late 19th century: from osteo- 'bone' + Greek klastēs 'breaker'.
ommatidium: "Each of the optical units that make up the compound eye of an insect", Late 19th century: modern Latin, from Greek ommatidion, diminutive of omma, ommat- 'eye'.
opsimath: "A person who begins to learn or study only late in life", Late 19th century: from Greek opsimathēs, from opse 'late' + the stem math- 'learn'.