Definition for SI'NUS

SI'NUS, n. [L. a bay.]

  1. A bay of the sea; a recess in seashore, shore, or an opening into the land. – Burnet.
  2. In anatomy, a cavity in a bone or other part, wider at the bottom than at the entrance. – Encyc.
  3. In surgery, a little elongated cavity, in which pus is collected; an elongated abscess with only a small orifice. – Encyc. Parr.
  4. An opening; a hollow.

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