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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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