01 n. An opening; a hollow; a bending.
pl.
Sinus, Sinuses ((#))
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1.
An opening; a hollow; a bending.
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2.
A bay of the sea; a recess in the shore.
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3.
A cavity; a depression.(Anat. & Zool.)
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4.
A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice.(Med.)
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5.
A depression between adjoining lobes.(Bot.)
Phrases & compounds
Pallial sinus —
See under Pallial.
Sinus venosus —
The main part of the cavity of the right auricle of the heart in the higher vertebrates.