Nounelectric catfish (any species of family Malapteruridae, esp. species Malapterurus electricus)

Noun(person) slippery as an eel

Nounelectric catfish (any species of family Malapteruridae, esp. species Malapterurus electricus)

Nounupside-down catfish (Synodontis nigriventris)

Nounōnamazu (giant catfish thought to cause earthquakes)