os

os¹ [ɒs]

noun (plural ossa 'ɒsə) Anatomy a bone (used chiefly in Latin names of individual bones, e.g. os trapezium).

Origin

from L.

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os² [ɒs]

noun (plural ora 'ɔ:rə) Anatomy an opening or entrance to a passage.

Origin

C18: from L. os 'mouth'.