This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A legendary sea creature having the head and upper body of a man and the tail of a fish.

n. A legendary creature, human male from the waist up, fishlike from the waist down.

n. The male corresponding to mermaid; a sea man, or man fish.

n. A fabulous man of the sea, with the lower part of the body that of a fish.

n. In heraldry, same as triton.

n. United States singer who appeared in several musical comedies (1909-1984)

n. half man and half fish; lives in the sea

"We are told in one place a few lines further on that the merman is of humankind; and in another that he is a kind of fish (Night dccccxlv)."

mermaid   

vocaliser    vocalizer    singer    vocalist    imaginary being    imaginary creature   

merfolk    mermaid   

seaman    marmennill   

booba    fisher-boy    Nereid    demigod    sea-foam    behemoths    spaceholm    annalist    post-lunch    zodiacal