A spinose, plectognath fish of the Allantic shore associated with the US (esp. Chilo mycterus geometricus) getting the power of distending its human anatomy with liquid or atmosphere, in order to resemble a chestnut bur; -- called in addition basketball seafood, balloon seafood, and swellfish.
(n) A fish of the household Diodontidæ; a porcupine-fish.
How would you define bur fish?