from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various hormones produced by plants that control or regulate germination, growth, metabolism, or other physiological activities.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry 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.

  • noun (botany) a plant product that acts like a hormone


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