SI'NUS, n. [L. a bay.] 1. A bay of the sea; a recess in the shore , or an opening in the land.2. In anatomy, a cavity in a bone or other part, wider at the bottom than at the entrance.3. In surgery, a little cavity or sack in which pus is collected; an abscess with only a small orifice.4. An opening; a hollow.
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