Source : Webster's Revised Unabridged Dictionary (1913)

Lagemorpha \Lag`e*mor"pha\, n. pl. [NL., fr. Gr. ? a hare + ?
   form.] (Zo["o]l.)
   A group of rodents, including the hares. They have four
   incisors in the upper jaw. Called also {Duplicidentata}.

Source : WordNet®

Duplicidentata
     n : in former classifications considered a suborder of Rodentia
         coextensive with the order Lagomorpha: gnawing animals