From Longman Dictionary of Contemporary Englisheggheadegg‧head /ˈeɡhed/ noun [countable] informal INTELLIGENTsomeone who is very intelligent, and only interested in ideas and books
Examples from the Corpus
egghead• You know, the egghead, absent-minded-professor types with bad haircuts and corduroy jackets with elbow patches.• Out goes the stereotype of the egghead with staring eyes trying to see through bottle-end glasses.• And school was never like this ... the egghead with a new slant on science.• It all began in 1981, when he was still a young egghead musician on the junior faculty at Yale University.• Stand your eggheads in egg-cups or make circles of paper collars to stand them on. 