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n. pl. de·cid·u·as or de·cid·u·ae (--ē′) A mucous membrane lining the uterus, modified during pregnancy and shed at parturition or during menstruation. [New Latin (membrāna) dēcidua, (membrane) that falls off, from Latin dēciduus, falling off; see DECIDUOUS.] de·cidu·al adj. |
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