# cotyledon

> English word · Noun · IPA /ˌkɒt.ɪˈliː.dən/

## Definitions
1. Each of the patches of villi on the foetal chorion in the placenta of ruminants and some other mammals.
2. The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.

## Etymology
From Latin cotylēdōn, from Ancient Greek κοτυληδών (kotulēdṓn, “cup-shaped cavity”), from κοτύλη (kotúlē, “cup”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/cotyledon