n 1  :  one of several or many like units into which something is divided or of which it is composed  :  a proportional division or ingredient <mix the powder with three s of water>  <the compound contained two s oxygen>   2  :  a portion of an animal body: as  a  :  an essential anatomical element  :  ORGAN, MEMBER <the chief s of the digestive system are the esophagus, stomach, intestine, and associated glands>   b  :  an indefinite area or one lacking or not considered in respect to a natural boundary <bathe the affected with warm water>  .
 
 
 
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