heteradelphus

heteradelphus

 [het″er-ah-del´fus]
conjoined twins with one fetus markedly more developed than the other.

het·er·a·del·phus

(het'ĕr-ă-del'fŭs),
Unequal conjoined twins in which the smaller incomplete parasite is attached to the larger, more nearly normal autosite. See: conjoined twins.
[heter- + G. adelphos, brother]

heteradelphus

a twin monster with one fetus more developed than the other.