Thesaurus: sinus

of Sinus

Definitions

pl. of Sinus
n. An opening; a hollow; a bending.
n. A bay of the sea; a recess in the shore.
n. A cavity; a depression.
n. A cavity in a bone or other part, either closed or with a narrow opening.
n. A dilated vessel or canal.
n. A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice.
n. A depression between adjoining lobes.
n. an abnormal passage leading from a suppurating cavity to the body surface
n. any of various air-filled cavities especially in the bones of the skull
n. a wide channel containing blood; does not have the coating of an ordinary blood vessel
1. An opening; a hollow; a bending. 2. A bay of the sea; a recess in the shore. 3. (Anat. & Zoöl.) 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. (Zoöl.) See under Pallial. -- Sinus venosus. Etym: [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.