triophthalmos

Conjoined twins with union in the facial region such that there is a common eye on the joined sides; a variety of opodidymus. See conjoined twins, under twin. [tri- + G. ophthalmos, eye]

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tri·oph·thal·mos (tri″of-thalґmos) [tri- + Gr. ophthalmos eye] a double-faced fetus with three eyes.