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From The Collaborative International Dictionary of English v.0.48:
Monocotyledon \Mon`o*cot`y*le"don\, n. [Mono- + cotyledon: cf. F. monocotyl['e]done.] (Bot.) A plant with only one cotyledon, or seed lobe; a member of the Monocotyledonae. [1913 Webster] Note: The plural, monocotyledons, is used as the name of a large class of plants (the Monocotyledones, or Monocotyledonae), and is generally understood to be equivalent to the term endogens. [1913 Webster] Monocotyledonae