os

I

[[t]ɒs[/t]]

n. pl. os•sa [[t]ˈɒs ə[/t]]

anat. zool. a bone

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Etymology: 1540–50; < L II

os

[[t]ɒs[/t]] n. pl. o•ra [[t]ˈɔr ə, ˈoʊr ə[/t]]

anat. zool. a mouth or orifice of the body

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Etymology: 1730–40; < L ōs mouth