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sinuses |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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. 2. A bay of the sea; a recess in the shore. 3. (Anat. & Zo["o]l.) 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. 4. (Med.) A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice. 5. (Bot.) A depression between adjoining lobes. Note: A sinus may be rounded, as in the leaf of the white oak, or acute, as in that of the red maple. {Pallial sinus}. (Zo["o]l.) 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.
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