allantoidoangiopagus

om·pha·lo·an·gi·op·a·gus

(om'fă-lō-an'jē-op'ă-gŭs),

Unequal conjoined twins in which the parasite derives its blood supply from the placenta of the autosite. See: conjoined twins.

Synonym(s): allantoidoangiopagus

[omphalo- + G. angeion, vessel, + pagos, something fixed]

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al·lan·toid·o·an·gi·op·a·gous twins

unequal monochorial twins with fusion of their allantoic vessels within the placenta; the lesser twin is essentially a parasite on the placental circulation of the larger twin.