Pus \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.

Source: Webster's Revised Unabridged Dictionary (1913)