Sinus

[Si·nus]

A sinus infection is when the sinuses near your nose get clogged and your face aches. Good times. That’s the kind of sinus people talk about, but a sinus is any kind of space, cavity, or passage in a person's body.

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An opening; a hollow; a bending.

Noun
a wide channel containing blood; does not have the coating of an ordinary blood vessel

Noun
any of various air-filled cavities especially in the bones of the skull

Noun
an abnormal passage leading from a suppurating cavity to the body surface

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.

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'94l.) 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. &hand; 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'94l.) 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.

An opening; a hollow; a bending.

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Usage Examples
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