(botany) Any plant whose seedlings typically have one cotyledon (seed leaf) (in contrast to the two cotyledons typical of dicots), thereby belonging to the taxonomic monocots, formerly variously known as Monocotyledones, Monocotyledonae, or Liliopsida, a class in the angiosperms (Angiospermae), the flowering plants.

plural of monocotyledon

(botany) Of or pertaining to a flowering plant having a seed with one embryonic leaf (a single cotyledon).

(botany) The condition of being monocotyledonous.