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The Collaborative International Dictionary of English v.0.48 (gcide)

O \O\ ([=o]), n.; pl. {O's} or {Oes} ([=o]z).
1. The letter O, or its sound. "Mouthing out his hollow oes
and aes." --Tennyson.
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2. Something shaped like the letter O; a circle or oval.
"This wooden O [Globe Theater]". --Shak.
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3. A cipher; zero. [R.]
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Thou art an O without a figure. --Shak.
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Os \Os\, n.; pl. {Ossa}. [L.]
A bone.
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Os \Os\, n.; pl. {Ora}. [L.]
A mouth; an opening; an entrance.
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Os \Os\, n.; pl. {Osar}. [Sw. [*a]s ridge, chain of hills, pl.
[*a]sar.] (Geol.)
One of the ridges of sand or gravel found in Sweden, etc.,
supposed by some to be of marine origin, but probably formed
by subglacial waters. The osar are similar to the kames of
Scotland and the eschars of Ireland. See {Eschar}.
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Os \Os\, n. (Chem.)
The chemical symbol for the element {osmium}.
[PJC]