cotyledon

cot·y·le·don   (kŏt'l-ēd'n)    n.   Botany A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges, and becomes green. Also called seed leaf. Anatomy One of the lobules constituting the uterine side of the mammalian placenta, consisting mainly of a rounded mass of villi. [Latin cotylēdōn, navelwort, from Greek kotulēdōn, from kotulē, hollow object.] cot'y·le'don·ar'y (-ēd'n-ěr'ē), cot'y·le'don·al (-ēd'n-əl), cot'y·le'do·nous (-ēd'n-əs) adj.

Main Entry: cot·y·le·don
Pronunciation: "kät-^&l-'Ed-^&n
Function: noun
1 : a lobule of amammalian 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 (as ferns) —cot·y·le·don·ary /-'Ed-^&n-"er-E/ adjective

cotyledon cot·y·le·don (kŏt'l-ēd'n)
n.

1. One of the lobules constituting the uterine side of the placenta, consisting mainly of a rounded mass of villi.

2. A leaf of the embryo of a seed plant, which, upon germination either remains in the seed or emerges, enlarges, and becomes green; a seed leaf.