GNU Collaborative International Dictionary of English

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1.       
   Pus (?), n. [L., akin to Gr. , , and to E. foul: cf. F. pus. See Foul, a.] (Med.) The yellowish white opaque creamy matter produced by the process of suppuration. It consists of innumerable white nucleated cells floating in a clear liquid.
   
   [1913 Webster]