Dī'o-don, n.

n. [Gr. δι, for δὶς, twice, double, and ὀδούς, ὀδόντος, a tooth; Fr. diodon.] (Ichth.) The globe-fish; a genus of fishes having the skin armed with erectile spines, and one tooth occupying the whole of each jaw, and having the power to inflate the body with air, so as to make it assume the shape of a ball.