• WordNet 3.6
    • n whitecap a wave that is blown by the wind so its crest is broken and appears white
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Webster's Revised Unabridged Dictionary
    • Whitecap 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.
    • Whitecap A wave whose crest breaks into white foam, as when the wind is freshening.
    • Whitecap (Zoöl) The European redstart; -- so called from its white forehead.
    • Whitecap (Zoöl) The European tree sparrow.
    • Whitecap (Zoöl) The whitethroat; -- so called from its gray head.
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Century Dictionary and Cyclopedia
    • n whitecap The inner chaff of wheat: chiefly in the plural.
    • n whitecap The male redstart, a bird, Ruticilla phœnicura. See first cut under redstart.
    • n whitecap The tree-or mountain-sparrow, Passer montanus.
    • n whitecap plural The common mushroom, Agaricus campestris.
    • n whitecap Nautical, a wave with a broken crest showing as a white patch; a white horse.
    • n whitecap [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.
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In literature:

The sea now came tumbling in astern in long black rolls, broken now and again by whitecaps.
"The Young Alaskans" by Emerson Hough
A brisk wind whipped up the whitecaps.
"The Mission of Janice Day" by Helen Beecher Long
Why, there's scarcely a whitecap on the water.
"A Pirate of Parts" by Richard Neville
There was not enough wind to make foam or whitecaps.
"Smugglers' Reef" by John Blaine
Then the wind came up, moaning through the forest in melancholy fashion and sending thousands of whitecaps across the surface of the lake.
"Dave Porter At Bear Camp" by Edward Stratemeyer
Ahead they could see the whitecaps marking the fierce cross currents that have given this half-mile wide inlet its bad name.
"Motor Boat Boys Down the Coast" by Louis Arundel
It was a calm, clear day without even a single whitecap to mar the blue perfection of the sea.
"The Pirates of Shan" by Harold Leland Goodwin
Already the wind was freshening, ruffling up the whitecaps in all directions.
"At the Fall of Port Arthur" by Edward Stratemeyer
As their dugouts veered into the Rio Cobre, the whitecaps gave way to placid ripples.
"Caribbee" by Thomas Hoover
Large-bellied and whitecapped, he wears an air of prosperity and independence.
"Prison Memoirs of an Anarchist" by Alexander Berkman

In poetry:

Blossoms blooming
Yet making no seed are
The sea-god's
Whitecaps offshore.
"Blossoms blooming" by Ono no Komachi
Cranes among the reeds
Standing by the water's edge:
The gusting wind has
Brought near, and not retrieved
These whitecaps, or so it seems.
"Cranes among the reeds" by Ki no Tsurayuki

In news:

But while a five-week streak continued for the Whitecaps pitching staff, they still beat Beloit 4-3 Friday at Pohlman Field.
All-Star Larry Parrish Is New Whitecaps Manager.
The Tigers And Whitecaps Are Having A Tryout .
Melvin Mercedes threw 3.1 innings of shutout relief to keep the Whitecaps close in Lake County.
Death of Vancouver Whitecaps' W-League team 'pretty upsetting ' for players.
A few West Michigan Whitecaps on Tuesday visited with some patients at Mary Free Bed Rehabilitation Hospital in Grand Rapids.
Wade Gaynor, a 22-year-old third baseman out of Western Kentucky, continues to be the catalyst of the West Michigan Whitecaps' offense.
EASTLAKE, OH – The West Michigan Whitecaps cannot seem to shake the injury bug.
George Weston , Osisko Mining, Whitecap Resources.
Vancouver Whitecaps defeat Colorado Rapids 1-0.
Whitecaps hand Chivas USA its seventh consecutive loss.
Galaxy rallies to defeat Whitecaps , 2-1.
A look at the playing, coaching career of new Whitecaps manager Larry Parrish.
Former Whitecaps manager Bruce Fields out as big league hitting instructor.
Whitecaps don't expect to wait much longer for new manager.