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Webster 1913 Edition

Noun.

(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.

A wave whose crest breaks into white foam, as when the wind is freshening.

See also: white cap

whitecap ‎(plural whitecaps)

Any of several birds having a white patch on the head.
A wave having a white crest; a breaker.
(US, historical) A member of a self-appointed vigilante committee that carried out lynchings. Some early ones wore white hoods or masks.