from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various hormones produced by plants that control or regulate germination, growth, metabolism, or other physiological activities. Also called phytohormone.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of many substances, produced by plants, that control or regulate their germination, growth, metabolism etc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (botany) a plant product that acts like a hormone
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