| monoamniotic | Denoting two or more progeny of a multiple pregnancy that have shared a common amniotic sac. (05 Mar 2000) |
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| monochorionic monoamniotic placenta | Depending on the stage at which twinning took place; if twinning occurs early, there may be a fused placenta with two chorionic and two amniotic membranes. Alternative form: monochorionic diamniotic placenta (05 Mar 2000) |
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