from The Century Dictionary.
- A superclass of extinct, fish-like vertebrates, the Ostracodermi of Cope and other writers: contrasted with Cyclostomata, the lampreys, and Gnathostomata, vertebrates with true jaws.
- An order or suborder of fishes, confined to the eastern seas, alone represented by the family Pegasidœ, of uncertain position, supposed to be related to the mail-cheeked series of acanthopterygians. Originally written in the French form Hypostomides by Duméril.
- A group of echinoderms.
- Infusorians in which the mouth is inferior or ventral.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
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