hypogastropagus

Twins joined at the hypogastrium. See conjoined twins, under twin. [hypogastrium + G. pagos, fr. pegnynai, to fasten]

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hy·po·gas·trop·a·gus (hi″po-gəs-tropґə-gəs) [hypo- + gastro- + -pagus] conjoined twins united at the hypogastric region.