allantoidoangiopagus /al′əntoi′dō·an′jē·op″əgəs/ [Gk, allantoeides, sausagelike, angeion, vessel, pagos, fixed] , conjoined monozygotic twin fetuses of unequal size that are united by the vessels of the umbilical cord. Also called omphaloangiopagus. See also omphalosite. −allantoidoangiopagous, adj.
