Webster’s Revised Unabridged Dictionary · 1913
Bur fish
Bur′ fish′ (bûr′ fish′). (Zoöl.) A spinose, plectognath fish of the Allantic coast of the United States (esp. Chilo mycterus geometricus) having the power of distending its body with water or air, so as to resemble a chestnut bur; — called also ball fish, balloon fish, and swellfish.