A close-fitting cap or protective covering for the head, often used in sports, medicine, or military contexts for protection or identification.
From 'head' + 'cap' (from Latin 'cappa' meaning a cloak or hood). A relatively modern compound combining two common English words for head coverings.
Headcaps in medical contexts can monitor brain activity, while sports headcaps protect athletes—the same word describes devices doing vastly different jobs!
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