Meaning

noun a tight-fitting headdress

noun a top (as for a bottle)

noun a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive

originEtymology tree Late Latin [Term?]? Late Latin cappabor. Proto-West Germanic *kappā Proto-West Germanic *kappijā Old English cæppe Middle English cappe English cap Inherited from Middle English cappe, from Old English cæppe, from Proto-West Germanic *kappā (“covering, hood, mantle”), from Late Latin cappa, itself from Latin caput. Doublet of cape, chape, and cope.

Etymology from Wiktionary, CC BY-SA 3.0