Relating to or having a single chorion; denoting monovular twins. ... Synonym: monochorial. ... (05 Mar 2000) ... 
(mon″o-kor″e-on´ik) having or developing in a common chorionic sac; said of monozygotic twins.
Type: Term Pronunciation: mon′ō-kō′rē-on′ik Definitions: 1. Relating to or having a single chorion; denoting monovular twins. Synonyms: monochorial
One placenta.