Definition of merman noun from the Oxford Advanced American Dictionary

 

merman

 noun
noun
NAmE//ˈmərmæn//
 
(pl. mermen
NAmE//ˈmərmɛn//
 
)
 
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(in stories) a creature with a man's head and body, and a fish's tail instead of legs, like a male mermaid
See the Oxford Advanced Learner's Dictionary entry: merman