pie plant piep·lant uncommon noun 1. long-cultivated hybrid of Rheum palmatum; stems often cooked in pies or as sauce or preserves Synonymspie plantgarden rhubarbRheum cultorumRheum rhabarbarumRheum rhaponticum Related words Broader terms rhubarb WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
