Tra`chy*stom"a*ta (?), n. pl. [NL.,fr.Gr. rough + stoma.] Zool.
An order of tailed aquatic amphibians, including Siren and Pseudobranchus. They have anterior legs only, are eel-like in form, and have no teeth except a small patch on the palate. The external gills are persistent through life.
© Webster 1913.