whitecap

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A wave with a crest of foam.

Century Dictionary and Cyclopedia

1. n. The inner chaff of wheat: chiefly in the plural.
2. n. The male redstart, a bird, Ruticilla phœnicura. See first cut under redstart.
3. n. The tree-or mountain-sparrow, Passer montanus.
4. n. 3. plural The common mushroom, Agaricus campestris.
5. n. Nautical, a wave with a broken crest showing as a white patch; a white horse.
6. n. [capitalized] One of a self-constituted body or committee of persons, who, generally under the guise of rendering service or protection to the community in which they dwell, commit various outrages and lawless acts.

Wiktionary

1. n. any of several birds having a white patch on the head
2. n. a wave having a white crest; a breaker

GNU Webster's 1913

1. n. The European redstart; -- so called from its white forehead.
2. n. The whitethroat; -- so called from its gray head.
3. n. The European tree sparrow.
4. n. A wave whose crest breaks into white foam, as when the wind is freshening.
5. n. United States 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.

WordNet 3.0

1. n. a wave that is blown by the wind so its crest is broken and appears white