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allantoidoangiopagous twins

(ăl′ən-toi′dō-ăn′jē-ŏpə-gəs)
pl.n.
  1. Unequal monozygotic twins with fusion of their allantoic vessels within the placenta.omphaloangiopagous twins
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.