Monocotyledon definitions

mŏn'ə-kŏt'
Any of various flowering plants, such as grasses, lilies, and palms, having a single cotyledon in the seed, and usually a combination of other characteristics, typically leaves with parallel veins, a lack of secondary growth, and flower parts in multiples of three.
noun
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Any of a class (Liliopsida) of angiosperms, including lilies, orchids, and grasses, having an embryo containing only one cotyledon, and characterized by parallel-veined leaves, flower parts in multiples of three, and no secondary growth in stems and roots.
noun
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Any of a class of angiosperm plants having a single cotyledon in the seed. Monocotyledons have leaves with parallel veins, flower parts in multiples of three, and fibrous root systems. Their primary vascular bundles are scattered throughout the stem, not arranged in a ring as in eudicotyledons. Grasses, palms, lilies, irises, and orchids are monocotyledons.
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(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 Angiospermae, the flowering plants. This group include the grasses, lilies, orchids and palms.
noun
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Origin of monocotyledon

mono- +"Ž cotyledon