Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Botany A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges, and becomes green. Also called seed leaf.
  • n. Anatomy One of the lobules constituting the uterine side of the mammalian placenta, consisting mainly of a rounded mass of villi.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.

Etymologies

Latin cotylēdōn, navelwort, from Greek kotulēdōn, from kotulē, hollow object.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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  • The orifice of the menstrual veins and arteries.

    ". . . the cotyledons of her matrix were presently loosed, through which the child sprang up and leaped. . ."

    April 23, 2011