n. 1 the bony case of the brain of a vertebrate. 2 a the part of the skeleton corresponding to the head. b this with the skin and soft internal parts removed. c a representation of this. 3 the head as the seat of intelligence. out of one's skull sl. out of one's mind, crazy. skull and crossbones a representation of a skull with two thigh-bones crossed below it as an emblem of piracy or death. skull session US sl. a discussion or conference. skulled adj. (also in comb.).
[ ME scolle: orig. unkn. ]