GymnotusGym*no"tus\, n. [NL., fr. Gr. gymno`s naked + ? the back: cf. F. gymnote.] (Zo["o]l.) A genus of South American fresh-water fishes, including the Gymnotus electricus, or electric eel. It has a greenish, eel-like body, and is possessed of electric power. One fearful shock, fearful but momentary, like from the electric blow of the gymnotus. --De Quincey.