Definition of jarhead noun from the Oxford Advanced American Dictionary

 

jarhead

 noun
noun
NAmE//ˈdʒɑrhɛd//
 
(informal)
 
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a member of the U.S. 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 Learner's Dictionary entry: jarhead