Definition of egghead noun from the Oxford Advanced Learner's Dictionary

 

egghead

 noun
noun
BrE BrE//ˈeɡhed//
 
; NAmE NAmE//ˈeɡhed//
 
(informal, disapproving or humorous)
 
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a person who is very intelligent and is only interested in studying Word Originby analogy with a bald head.
See the Oxford Advanced American Dictionary entry: egghead