Source : Webster's Revised Unabridged Dictionary (1913)

Anurous \A*nu"rous\, a. (Zo["o]l.)
   Destitute of a tail, as the frogs and toads. [Also written
   {anourous}.]

Source : WordNet®

anurous
     adj : not having a tail; "anurous toads and frogs" [syn: {tailless}]