Definitions for: Cotyledon

[n] embryonic leaf in seed-bearing plants

Webster (1913) Definition: Cot`y*le"don (k?t`?-l?"d?n), n. [Gr.??? a cupshaped
hollow, fr. ???. See Cotyle.]
1. (Anat.) One of the patches of villi found in some forms of
placenta.

2. (Bot.) A leaf borne by the caulicle or radicle of an
embryo; a seed leaf.

Note: Many plants, as the bean and the maple, have two
cotyledons, the grasses only one, and pines have
several. In one African plant (Welwitschia) the
cotyledons are permanent and grow to immense
proportions.

Synonyms: seed leaf

See Also: foliage, leaf, leafage

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