synchorial

syn·cho·ri·al

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

synchorial

[singkôr′ē·əl]
Etymology: Gk, syn + chorion, skin
pertaining to multiple fetuses that share a common placenta, as in monozygosity.

synchorial

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