monochorionic-diamniotic (‘mono/di’) twins Mono-di means monochorionic, diamniotic monochorionic-diamniotic (‘mono/di’) twins di/di fraternal di/di fraternal monochorionic-diamniotic (‘mono/di’) twins http://www.baby2see.com/multiples/twins.html Mono-di means monochorionic, diamniotic Twins in Pregnancy Baby2See.com