Definition of cotyledon in English:

cotyledon

Syllabification: cot·y·le·don
Pronunciation: /ˌkädəˈlēdn
 
/

noun

Botany
An embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed.
More example sentences
  • The cotyledons are the ‘seed leaves’ produced by the embryo.
  • However, protein biosynthesis in the axis organs and cotyledons of dicotyledonous seeds commences much earlier.
  • Mutants of this class display shortened hypocotyls and small cotyledons after irradiation of seed.

Origin

mid 16th century (denoting a patch of villi on the placenta of mammals): from Latin, 'navelwort' (which has cup-shaped leaves), from Greek kotulēdōn 'cup-shaped cavity', from kotulē 'cup'.

Derivatives

cotyledonary

Pronunciation: /-ˈēdnˌerē/
adjective
More example sentences
  • Three chlorophyll readings were made and averaged on the middle leaflet of the first trifoliate of soybean, the second true leaf of lettuce (counting up from the cotyledonary leaves) and the second leaf of wheat.
  • Seedlings at the vegetative cotyledonary stage, about 7-10 days old, were transplanted into plastic pots containing the same medium.
  • Further development of cotyledonary embryo showing closed vascular system and characteristic cotyledonary notches.

Definition of cotyledon in:

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Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit