gastroacephalus

Unequal conjoined twins in which an acephalous parasite is attached to the abdomen of the autosite. See conjoined twins, under twin. [gastro- + G. a- priv. + kephale, head]

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gas·tro·aceph·a·lus (gas″tro-ə-sefґə-ləs) [gastro- + acephalus] asymmetrical conjoined twins in which the larger twin bears the smaller one as a headless parasite on its abdomen.