Hat (hät), adjective Hot. [Obs.] Chaucer.

Hat, singular present of Hote to be called. Cf. Hatte. [Obs.]

“That one hat abstinence.” Piers Plowman.

Hat (hăt), noun [AS. hæt, hætt; akin to Dan. hat, Sw. hatt, Icel. hattr a hat, höttr hood, D. hoed hat, G. hut, OHG. huot, and prob. to L. cassis helmet. √13. Cf. Hood.]

A covering for the head; esp., one with a crown and brim, made of various materials, and worn by men or women for protecting the head from the sun or weather, or for ornament.

-- Websters 1913