'Commelinidae' definitions:
Definition of 'Commelinidae'
(from WordNet)
noun
One of four subclasses or superorders of Monocotyledones; comprises about 19,000 species in 25 families of mostly terrestrial herbs especially of moist places including: Cyperaceae; Gramineae; Bromeliaceae; and Zingiberaceae [syn: Commelinidae, subclass Commelinidae]