synchorial

syn·cho·ri·al

(sin-kō'rē-ăl), Relating to fused chorions as are found in multiple-fetus pregnancies. [syn- + chorion]

synchorial

S26-926060 (sĭn-kō′rē-ăl) [″ + chorion, chorion] Pert. to multiple fetuses that share a single placenta.