The Collaborative International Dictionary of English v.0.48:
Cyperus \Cyp"e*rus\ (s?p"?-r?s), n. [NL., from Gr. ???? sedge.] (Bot.) A large genus of plants belonging to the Sedge family, and including the species called galingale, several bulrushes, and the Egyptian papyrus. [1913 Webster]WordNet (r) 3.0 (2006):
Cyperus n 1: type genus of Cyperaceae; grasslike rhizomatous herbs; cosmopolitan except very cold regions [syn: Cyperus, genus Cyperus]