Diodon

·noun A genus of whales.

II. Diodon ·noun A genus of spinose, plectognath fishes, having the teeth of each jaw united into a single beaklike plate. They are able to inflate the body by taking in air or water, and, hence, are called globefishes, swellfishes, ·etc. Called also porcupine fishes, and sea hedgehogs.