Etymology
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Words related to cap

skull-cap (n.)
1680s, from skull (n.) + cap (n.).
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whitecap (n.)
1660s, of birds, from white (adj.) + cap (n.). Attested from 1773 in reference to breaking waves, from 1818 of mushrooms, and from 1891 in reference to "one of a self-constituted band in U.S. who committed outrages under pretense of regulating public morals" [OED].

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