Webster's English Dictionary

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biretta

bi.ret.ta \b*-'ret-*\ n [It berretta, fr. OProv berret cap, irreg. fr. LL 
   birrus cloa]k with a hood, of Celt origin; akin to MIr berr short : a 
   square cap with three ridges on top worn by clergymen esp. of the Roma n 
   Catholic Church