Learn how to say Cotyledons correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word cotyledon:
a simple embryonic leaf in seed-bearing plants, which, in some species, forms the first green leaf after germination
a tuft of villi on the mammalian placenta
ˌcotyˈledonous, ˌcotyˈledoˌnoid adjective
C16: from Latin: a plant, navelwort, from Greek kotulēdōn, from kotulē cup, hollow