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From Middle English hat, from Old English hætt, from Proto-Germanic *hattuz (“hat”), perhaps from a late PIE root Proto-Indo-European *kedʰ- (“to guard, cover, care for, protect”) or wanderwort.
Cognate with North Frisian hat (“hat”), Danish hat (“hat”), Swedish hatt (“hat”), Icelandic hattur (“hat”), Finnish hattu (“hat”), Latin cassis (“helmet”), Lithuanian kudas (“bird's crest or tuft”), Avestan 𐬑𐬀𐬊𐬛𐬀 (xaoda, “hat”), Persian خود (xud, “helmet”), Welsh cadw (“to provide for, ensure”). Compare also hood.
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