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1 definition found
 for Sinus
From The Collaborative International Dictionary of English v.0.48 :

  Sinus \Si"nus\, n.; pl. L. Sinus, E. Sinuses. [L., a bent
     surface, a curve, the folds or bosom of a garment, etc., a
     bay. Cf. Sine, n.]
     1. An opening; a hollow; a bending.
        [1913 Webster]
     2. A bay of the sea; a recess in the shore.
        [1913 Webster]
     3. (Anat. & Zool.) A cavity; a depression. Specifically:
        (a) A cavity in a bone or other part, either closed or
            with a narrow opening.
        (b) A dilated vessel or canal.
            [1913 Webster]
     4. (Med.) A narrow, elongated cavity, in which pus is
        collected; an elongated abscess with only a small orifice.
        [1913 Webster]
     5. (Bot.) A depression between adjoining lobes.
        [1913 Webster]
     Note: A sinus may be rounded, as in the leaf of the white
           oak, or acute, as in that of the red maple.
           [1913 Webster]
     Pallial sinus. (Zool.) See under Pallial.
     Sinus venosus. [L., venous dilatation.] (Anat.)
        (a) The main part of the cavity of the right auricle of
            the heart in the higher vertebrates.
        (b) In the lower vertebrates, a distinct chamber of the
            heart formed by the union of the large systematic
            veins and opening into the auricle.
            [1913 Webster]

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