Di"o*don (?), n. [Gr. = twice + , , a tooth: cf. F. diodon.]
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. fishes, and sea hedgehogs.
A genus of whales.
© Webster 1913.