| monocotyledones | (n) comprising seed plants that produce an embryo with a single cotyledon and parallel-veined leaves: includes grasses and lilies and palms and orchids; divided into four subclasses or superorders: Alismatidae; Arecidae; Commelinidae; and Liliidae, Syn. Liliopsida, class Monocotyledones, Monocotyledonae, class Monocotyledonae, class Liliopsida |