White·cap n.
 1. Zool. (a) The European redstart; -- so called from its white forehead.  (b) The whitethroat; -- so called from its gray head.  (c) The European tree sparrow.
 2. A wave whose crest breaks into white foam, as when the wind is freshening.
 3. A member of a self-appointed vigilance committee attempting by lynch-law methods to drive away or coerce persons obnoxious to it. Some early ones wore white hoods or masks. [U. S.] -- White*cap, v. -- White*cap*per n.

 ◄ ►