si·nus
n : a cavity or hollow in the body: as a : a narrow elongated tract extending from a focus of suppuration and serving for the discharge of pus <a tuberculous > b (1) : a cavity in the substance of a bone of the skull that usu. communicates with the nostrils and contains air (2) : a channel for venous blood (3) : a dilatation in a bodily canal or vessel .
Similar sounding terms: sa·ni·es sa·ni·ous sci·ence se·ne·cio
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