ectopagus

Conjoined twins in which the bodies are joined laterally. See conjoined twins, under twin. [ecto- + G. pagos, something fixed]

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ec·top·a·gus (ek-topґə-gəs) [ecto- + -pagus] conjoined twins connected along the side of the body, so that the components are definitely right and left, the upper and/or lower limbs at the juncture being represented by single bilateral median limbs.