D defs.my
Entry 3 senses Webster, 1913

Whitecap

· White·cap · IPA
01 n. The European redstart; -- so called from its white forehead.
  1. 1.
    The European redstart; -- so called from its white forehead.(Zool.)
  2. 2.
    A wave whose crest breaks into white foam, as when the wind is freshening.
  3. 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.]