OrnithoscelidaOr*ni`tho*scel"i*da\, n. pl. [NL., fr. Gr. ?, ?, a bird + ? a leg.] (Zo["o]l.) A group of extinct Reptilia, intermediate in structure (especially with regard to the pelvis) between reptiles and birds. -- Or`ni*tho*scel"i*dan, a.
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