monochorial

mon·o·cho·ri·on·ic

(mon'ō-kō'rē-on'ik),
Relating to or having a single chorion; denoting monovular twins.
Synonym(s): monochorial

monochorial

said of twins that have developed sharing a single chorion. Called also monochorionic.
References in periodicals archive ?
Placental weight measured at birth was available for 17 of 46 bichorial twin pregnancies (mean, 964 g; median, 985 g; range, 600-1270 g) and for 5 of 7 monochorial twin pregnancies (mean, 953 g; median, 735; range, 600-1530 g).
A linear regression model was then fitted to evaluate the difference between MM pregnancies, distinguished as monochorial and bichorial, and MF ones, correcting for effect of week of gestation (Table 1).