The Collaborative International Dictionary
Cyperaceous
Cyperaceous \Cyp`er*a"ceous\ (s?p`?r-?"sh?s or s?`p?r-), a. (Bot.) Of, pertaining to, or resembling, a large family of plants of which the sedge is the type.
Wiktionary
cyperaceous
a. (context botany English) Of or pertaining to the Cyperaceae, or sedges.