cotyledon
noun
cot·y·le·don
ˌkä-tə-ˈlē-dᵊn
1
: a lobule of the mammalian placenta
2
: the first leaf or one of the first pair or whorl of leaves developed by the embryo of a seed plant or of some lower plants (such as ferns) see seedling illustration
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Merriam-Webster unabridged
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