Noun
gymnote (plural gymnotes)
Any fish of the genus Gymnotus
The Gymnote proved effective in breaking blockades and surface ships had trouble spotting it. Source: Internet
Gymnote was also an electrically powered and fully functional military submarine. Source: Internet
She was launched on 24 September 1888 and would stay in service to 1908. citation The Gymnote underwent various trials to 1890, successful enough for the Navy to start building two "real fighting submarines", considerably larger. Source: Internet