What does whitecap mean?
A whitecap is a wave whose crest is covered or edged with white foam. The term is especially useful for describing rough seas, where numerous waves break and the whitecaps become conspicuous markers of the water’s movement. It can apply equally to oceans, lakes, and rivers, although it is most strongly associated with maritime settings and traditional nautical description. The image is literal: as a wave breaks, foam gathers over its crest, making the water appear to wear a white cap. Whitecap is a countable noun, with the plural whitecaps, and the related adjective form white-capped is common in phrases such as white-capped waves. Although the modern word usually denotes a foam-topped wave, it has also been used in older or literary contexts for someone wearing a white cap. Its transparent compound structure makes the image easy to understand while retaining a vivid connection to the appearance of breaking water.
nounA wave whose crest is covered or edged with white foam, especially when breaking on a beach or in rough water. The word can also refer, in older usage, to a person wearing a white cap.
- A wave marked by a crest of white foam.
- A person wearing a white cap, especially in older or literary usage.
"A whitecap curled beside the bow as the boat entered the choppy water."
"The wind lifted whitecaps across the surface of the lake."
"In the older expression, a whitecap was someone distinguished by a white hat."
The regular plural is used for individual foam-topped waves or collectively for waves breaking in rough water.
"Whitecaps streamed across the bay as the storm approached."
A wave gives away its breaking point with a flash of white: that bright, foaming crest is its whitecap.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of whitecap
The word is an English compound formed from the long-established words white and cap. Its dominant modern sense refers to the white foam that covers the crest of a breaking wave, so the name describes what the wave appears to be wearing. Older usage could also refer to a person wearing a white cap, reflecting the compound’s broader literal associations.
Related word forms
How whitecap is actually used
The nautical sense is standard in British and American English and is usually countable. The sense referring to a person in a white cap is dated or literary and is much less common.