class Liliopsida 1. (noun) 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 Synonyms: Liliopsida, Monocotyledonae, Monocotyledones, class Monocotyledonae, class Monocotyledones Related Words: class

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