prosopopagus

Unequal conjoined twins in which the parasite, in the form of a tumorlike mass, is attached to the orbit or cheek of the autosite. See conjoined twins, under twin. SYN: prosopagus. [prosopo- + G. pagos, something fastened]

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pros·o·pop·a·gus (pros″o-popґə-gəs) [prosopo- + -pagus] asymmetrical conjoined twins in which the parasite is attached to the face elsewhere than at the jaw.