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oxidation-reduction a chemical reaction in which atoms of one element lose electrons to the atoms of another.
oxide a compound that includes oxygen.
oxidize to combine with oxygen, as in burning or rusting. [4 definitions]
oxlip a primrose bearing clusters of pale yellow flowers in early spring.
oxpecker either of two African birds, related to starlings, that feed on ticks living on the hides of large animals.
oxtail the tail of an ox, esp. when skinned and used as the main ingredient in soup or stew.
oxy-1 acute; sharp; pointed.
oxy-2 oxygen.
oxyacetylene relating to the combination of acetylene and oxygen in producing a high temperature flame for welding and cutting.
oxycephaly a condition in which the skull is somewhat peaked or conical, as the result of premature closing of the skull sutures.
oxygen a chemical element that has eight protons in each nucleus and that occurs in pure form, as a colorless, odorless gas essential to the respiration of living things, or in important compounds such as water, carbohydrates, and oxide minerals. (symbol: O)
oxygenate to combine, supply, or treat with oxygen.
oxygenless combined form of oxygen.
oxygen tent a transparent, tentlike enclosure that is fitted around the head and shoulders of a bedridden patient to form a chamber into which oxygen can be released.
oxyhydrogen of or pertaining to a mixture of oxygen and hydrogen. [2 definitions]
oxymoron a figure of speech in which an apparent contradiction makes or highlights a point, as in the phrase "a frozen flame".
oxytocin a hormone produced by the pituitary gland that increases contractions of the uterus and stimulates milk production.
oyez hear ye! attention! (usu. called out three times by a court or public official to command silence before an official proclamation is made).
oyster any of various edible mollusks found chiefly in shallow water and characterized by a lumpy, irregular bi-valved shell, esp. the pearl oyster. [3 definitions]
oyster bed a place on the ocean floor where oysters naturally breed or one that is prepared for their cultivation.
oystercatcher any of several black and white shore birds having strong, reddish beaks with which they open and feed on bivalve mollusks such as oysters.