mer·man /-ˌmæn, mən/
  人魚,善泳的男子
  Mer·man n.; pl. Mermen  The male corresponding to mermaid; a sea man, or man fish.
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  Merman
       n 1: United States singer who appeared in several musical
            comedies (1909-1984) [syn: Ethel Merman]
       2: half man and half fish; lives in the sea