[tri.ton] n [L, fr. Gk Triton] 1 cap: a son of Poseidon described as a demigod of the sea with the lower part of his body like that of a fish
2. [NL, genus name, fr. L Triton]: any of various large marine gastropod mollusks (esp. family Ranellidae) with a heavy elongated conical shell; also: the shell
[2]tri.ton n [tritium +
[2]-on] (1934): the nucleus of tritium