单词 litoptern 释义 litoptern Palont.|ltptn|Also litopternan.[f. mod.L. name of order Litopterna (F. Ameghino 1889, in Actas Acad. Nac. Crdoba VI. 492), f. Gk. ῑ smooth + heel-bone.]An extinct South American ungulate mammal of the order so called. Henc...