from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The part of the axis of a plant embryo or seedling plant that is below the cotyledons.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In plants with seeds, that portion of the embryo or seedling between the root and cotyledons.
from The Century Dictionary and Cyclopedia
- n. In botany, that part of the axis which is below the cotyledons. Also called the caulicle, and erroneously the radicle.
hypo- + cotyl(edon).(American Heritage® Dictionary of the English Language, Fourth Edition)