Hat (hăt), n. [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.

Hat block, a block on which hats are formed or dressed. -- To pass around the hat, to take up a collection of voluntary contributions, which are often received in a hat. [Colloq.] Lowell.

Hat (hät), a. Hot. [Obs.] Chaucer.

Hat , sing. pres. of Hote to be called. Cf. Hatte. [Obs.] "That one hat abstinence." Piers Plowman.

-- Webster's unabridged 1913