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sinus

6 entries found.

Main Entry:
si·nus 
          Listen to the pronunciation of sinus
Pronunciation:
\ˈsī-nəs\
Function:
noun
Etymology:
Middle English, from Medieval Latin, from Latin, curve, fold, hollow
Date:
15th century
: cavity, hollow : as a: a narrow elongated tract extending from a focus of suppuration and serving for the discharge of pus b (1): a cavity in the substance of a bone of the skull that usually communicates with the nostrils and contains air (2): a channel for venous blood (3): a dilatation in a bodily canal or vessel c: a cleft or indentation between adjoining lobes (as of a leaf or corolla)


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