Sinus /(?)/

Si·nus

Sinus

n.

pl. Sinus, Sinuses

  1. An opening; a hollow; a bending.
  2. A bay of the sea; a recess in the shore.
  3. A cavity; a depression. (Anat. & Zool.)
  4. A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice. (Med.)
  5. A depression between adjoining lobes. (Bot.)

Phrases & Compounds
Pallial sinus
See under Pallial.
Sinus venosus
The main part of the cavity of the right auricle of the heart in the higher vertebrates.