different between epicotyl vs cotyledon

English

epicotyl (plural epicotyls)

(botany) In plants with seeds, that portion of the embryo or seedling above the cotyledons.

From Latin cotyl?d?n, from Ancient Greek ????????? (kotul?d?n, “cup-shaped cavity”), from ?????? (kotúl?, “cup”).

cotyledon (plural cotyledons)

(physiology) Each of the patches of vili on the foetal chorion in the placenta of ruminants and some other mammals.
- 1997, Roy Porter, The Greatest Benefit to Mankind, Folio Society 2016, p. 72:
  Forced to apply animal findings to humans, his human womb also had cotyledons like a dog's.
(botany) The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.

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