• (n.) The framework of some pods, as the cress, which remains after the valves drop off.
A longitudinal partition in an ovary, formed between parietal placentas. ... (09 Oct 1997) ... 
A persistent, membranous partition (placenta) that bears ovules on its margins and separates the two valves of the capsules in members of the mustard family (Brassicaceae).
Re'plum noun [ Latin , doorcase.] (Botany) The framework of some pods, as the cress, which remains after the valves drop off. Gray.