Sinus Definition

sīnəs
sinuses
noun
sinuses
A bend or curve.
Webster's New World
Any cavity or hollow formed by a bending or curving.
Webster's New World
A dilated channel or receptacle containing chiefly venous blood.
American Heritage Medicine
Any of various cavities, hollows, or passages.
Webster's New World
A rounded depression between two consecutive lobes, as of a leaf.
Webster's New World
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Other Word Forms of Sinus

Noun

Singular:
sinus
Plural:
sinuses

Origin of Sinus

  • Middle English hollow in the body from Medieval Latin from Latin curve, hollow

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin sinus.

    From Wiktionary

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