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Definition of Sinus

Sinus

  1. of Sinus
  2. An opening; a hollow; a bending.
  3. A bay of the sea; a recess in the shore.
  4. A cavity; a depression.
  5. A cavity in a bone or other part, either closed or with a narrow opening.
  6. A dilated vessel or canal.
  7. A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice.
  8. A depression between adjoining lobes.
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