Found 1 definition: gymnotus.
[CIDE DICTIONARY]
gymnotus, n. [NL., fr. Gr. gymno`s naked + nw^tos the back: cf. F. gymnote.].
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. [1913 Webster]
"One fearful shock, fearful but momentary, like that from the electric blow of the gymnotus." [1913 Webster]