Cyperaceae cy·pe·ra·ceae uncommon noun 1. bulrush; chufa; cotton grass; papyrus; umbrella plant Synonymsfamily Cyperaceaesedge family Related words Broader terms monocot family Narrower terms Cyperus Parts Graminales Part of sedgeCarexEriophorumScirpusEleocharis WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.