Source : WordNet®

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: {class Monocotyledones},
          {Monocotyledonae}, {class Monocotyledonae}, {Liliopsida},
          {class Liliopsida}]