swellfish

[ swel-fish ]
/ ˈswɛlˌfɪʃ /

noun, plural (especially collectively) swell·fish, (especially referring to two or more kinds or species) swell·fish·es.

Origin of swellfish

An Americanism dating back to 1800–10; swell + fish

British Dictionary definitions for swellfish

swellfish
/ (ˈswɛlˌfɪʃ) /

noun plural -fish or -fishes

a popular name for puffer (def. 2)