monocotyledon

noun1

1. •
   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.

   • Elachistine moths are the world’s most species-rich group of Lepidoptera that specialize on monocotyledon plants, especially grasses and sedges. — 2011