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

 

jarhead

 noun
noun
BrE BrE//ˈdʒɑːhed//
 
; NAmE NAmE//ˈdʒɑːrhed//
 
(North American English, informal)
 
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a member of the US Marine Corps (= American soldiers trained to serve on land or at sea) an accurate picture of a jarhead’s life His hair was as short as in his jarhead days.
See the Oxford Advanced American Dictionary entry: jarhead