uromelus

symmelia

 [sim-e´le-ah]
a developmental anomaly characterized by apparent fusion of the lower limbs. There may be three feet (tripodial symmelia), two feet (dipodial symmelia), one foot (monopodial symmelia), or no feet (apodal symmelia or sirenomelia).

uromelus

(u-rom'e-lus) [Gr. oura, tail, + melos, limb]
A congenitally deformed fetus in which the lower extremities are fused. Synonym: sirenomelia