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Sinus - Dictionary Definition and Overview |
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Sinus : (noun)
1: an abnormal passage leading from a suppurating cavity to the
body surface [syn: fistula]
2: any of various air-filled cavities especially in the bones
of the skull
3: a wide channel containing blood; does not have the coating
of an ordinary blood vessel [syn: venous sinus]
Based on WordNet 2.0
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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.
Based on Webster's Revised Unabridged Dictionary
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Sinus : Sinus: 1. An air-filled cavity in a dense portion of a skull bone. The sinuses decrease the weight of the skull. The sinuses are formed in four right-left pairs. The frontal sinuses
are positioned behind the forehead, while the maxillary sinuses are behind the cheeks. The sphenoid and ethmoid sinuses are deeper in the skull behind the eyes and maxillary sinuses. The sinuses are
lined by mucous-secreting cells. Air enters the sinuses through small opening in bone called ostia. If an ostium is blocked, air cannot pass into the sinus and likewise mucous cannot drain out. See
also: Sinusitis .
2. A channel permitting the passage of blood or lymph fluid that is not a blood or lymphatic vessel, such as the sinuses of the placenta.
3. A tract or fistula leading to a cavity which may be filled with pus.
The word was borrowed from the Latin noun "sinus," which means "curve, fold, or hollow." The same root gave rise to " sinuous ".
Based on Webster's Revised Unabridged Dictionary (1913)
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Example Usage of Sinus |
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rondreaameen: Sinus Infection!!! Ughhhhhhhhhh!!! |
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Broadset: Sinus confetti |
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blondemonde: I'm getting sick with a Sinus cold. THIS DOES NOT BODE WELL FOR OCC. |
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