Also found in: Encyclopedia.
|n. pl.||1.||(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's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.