Definitions for: Sinus

[n] a wide channel containing blood; does not have the coating of an ordinary blood vessel
[n] any of various air-filled cavities especially in the bones of the skull
[n] an abnormal passage leading from a suppurating cavity to the body surface

Webster (1913) Definition: 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.

Synonyms: fistula, venous sinus

See Also: bodily cavity, canal, cavernous sinus, cavity, cavum, channel, coronary sinus, duct, epithelial duct, ethmoid sinus, ethmoidal sinus, frontal sinus, maxillary sinus, nasal sinus, paranasal sinus, passage, passageway, sigmoid sinus, sinus cavernosus, sinus coronarius, sinus ethmoidales, sinus paranasales, sinus rectus, sinus sigmoideus, sinus transversus, straight sinus, tentorial sinus, transverse sinus

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