Definition of mesomorph noun from the Oxford Advanced American Dictionary

 

mesomorph

 noun
noun
NAmE//ˈmɛzəˌmɔrf//
 
, NAmE//ˈmizəmɔrf//
 
(biology)
 
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a person whose natural body shape is neither thin nor fat, with quite a lot of muscle
See the Oxford Advanced Learner's Dictionary entry: mesomorph