- heterodymus
- Unequal conjoined twins in which the incomplete parasite, consisting of head and neck and, to some extent, thorax, is attached to the anterior surface of the autosite. See conjoined twins, under twin. [hetero- + G. didymos, twin]
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het·er·od·y·mus (het″ər-odґə-məs) [hetero- + -didymus] asymmetrical conjoined twins in which one fetus has a second head, neck, and thorax attached to its thorax.
Medical dictionary. 2011.