Etymology
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merman (n.)

"fabulous sea-creature, man above and fish below," c. 1600, literally "man of the sea," from first element in mermaid (q.v.) + man (n.). The gender-neutral merpeople (1849 "Kit Bam's Adventures") and merfolk (1846) "inhabitants of the sea with human bodies and fish-like tails" seem to be more recent formations.

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Definitions of merman
1
merman (n.)
half man and half fish; lives in the sea;
2
Merman (n.)
United States singer who appeared in several musical comedies (1909-1984);
Synonyms: Ethel Merman
From wordnet.princeton.edu