From Middle English hat, from Old English hæt, from Proto-Germanic *hattuz ("hat"), from Proto-Indo-European *kadʰ- ("to guard, cover, care for, protect"). Cognate with North Frisian hat ("hat"), Danish hat ("hat"), Swedish hatt ("hat"), Icelandic hattur ("hat"), Latin cassis ("helmet"), Lithuanian kudas ("bird's crest or tuft"), Avestan 𐬑𐬀𐬊𐬛𐬀, Persian خود, Welsh cadw ("to provide for, ensure"). Compare also hood.
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