Bur fish \Bur" fish`\ (Zool.)
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}.
[1913 Webster]