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onyx a kind of banded multi-colored quartz, used as a semiprecious stone. [2 definitions]
oo- ovum; egg.
oocyte a cell in the earliest stage of transformation into a female egg; immature egg.
oodles (informal; sometimes used with a sing. verb) a great quantity.
oogenesis the process whereby female egg cells are produced.
oogonium a reproductive cell in some algae and fungi. [2 definitions]
ooh used to express pleasure, happy surprise, or amazement. [3 definitions]
oolite a variety of limestone made up of small spherical grains. [2 definitions]
oology the scientific study of birds' eggs.
oolong a dark tea of China and Taiwan that is partly fermented before it is dried.
oophorectomy a surgical operation involving the removal of one or both ovaries; ovariotomy.
oophoritis inflammation of one or both ovaries; ovaritis.
oops a mild expression of dismay, sudden embarrassment, or unpleasant surprise, esp. at one's own mistake; whoops.
ootheca an egg case, as of certain insects or mollusks.
ooze1 to seep out gradually and slowly, as liquid, gas, or sound may do. [7 definitions]
ooze2 any particularly soft mud, or an area, such as a marsh, that is soft and muddy. [2 definitions]
ooze leather calfskin, sheepskin, or goatskin leather, having a velvety finish.
oozy1 giving off, or wet with, moisture.
oozy2 of, like, or having soft mud.
op- against. [2 definitions]
opacity the quality, state, or degree of being opaque; lack of transparency. [4 definitions]