merman
noun/ˈmɜːmæn/
/ˈmɜːrmæn/
(plural mermen
/ˈmɜːmen/
/ˈmɜːrmen/
)- (in stories) a creature with a man’s head and body and a fish’s tail instead of legs, like a male mermaid
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merman
Definition of merman noun from the Oxford Advanced Learner's Dictionary