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Definition of: cotyledon
(kot′ə·lēd′n) noun
1. Bot. A seed leaf, or one of a pair or whorl of the first leaves from a sprouting seed.
2. A genus (Cotyledon) of succulent, ornamental herbs native to the Old World.
3. Anat. A subdivision of the uterine surface of the placenta. [<L, navelwort <Gk. kotylēdōn socket <kotyle a hollow, cavity]
—cot′y·le′do·nous, cot′y·le′do·nal adjective
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