— pegmatitic /peg'meuh tit"ik/ , adj.
/peg"meuh tuyt'/ , n. Petrol.
a coarsely crystalline granite or other high-silica rock occurring in veins or dikes.
[ 1825-35; pegmat- (s. of pêgma ) anything fastened together, a bond (Compare pegnýein to stick) + -ITE 1 ]