Usually means: Seed leaves in embryonic plants.
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We found 13 dictionaries that define the word cotyledons:

General (9 matching dictionaries)
  1. cotyledons: Merriam-Webster
  2. cotyledons: Collins English Dictionary
  3. cotyledons: Vocabulary.com
  4. cotyledons: Wordnik
  5. cotyledons: Cambridge Advanced Learner's Dictionary
  6. cotyledons: Wiktionary
  7. cotyledons: Dictionary.com
  8. Cotyledons: Wikipedia, the Free Encyclopedia
  9. Cotyledons: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Cotyledons: Encyclopedia

Medicine (2 matching dictionaries)
  1. cotyledons: Merriam-Webster Medical Dictionary
  2. Cotyledons: Medical dictionary

Slang (1 matching dictionary)
  1. cotyledons: Urban Dictionary

(Note: See cotyledon as well.)

Definitions from Wiktionary (cotyledon)

noun:  (physiology) Each of the patches of villi on the foetal chorion in the placenta of ruminants and some other mammals.
noun:  (botany) The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.
▸ Also see cotyledon

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