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sinus    音標拼音: [s'ɑɪnəs]
n. 竇,靜脈竇,灣,下陷或凹下去的地方

竇,靜脈竇,灣,下陷或凹下去的地方

sinus
n 1: an abnormal passage leading from a suppurating cavity to
the body surface [synonym: {fistula}, {sinus}]
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 [synonym: {venous sinus}, {sinus}]

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.
[1913 Webster]

2. A bay of the sea; a recess in the shore.
[1913 Webster]

3. (Anat. & Zool.) 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.
[1913 Webster]

4. (Med.) A narrow, elongated cavity, in which pus is
collected; an elongated abscess with only a small orifice.
[1913 Webster]

5. (Bot.) A depression between adjoining lobes.
[1913 Webster]

Note: A sinus may be rounded, as in the leaf of the white
oak, or acute, as in that of the red maple.
[1913 Webster]

{Pallial sinus}. (Zool.) 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.
[1913 Webster]

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