from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A plant hormone, C10H9NO2, that stimulates growth.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. an auxin plant hormone, synthesized in leaves, that stimulates growth, especially in the presence of ethylene
from the GNU version of the Collaborative International Dictionary of English
- n. A plant hormone (C10H9NO2) recognized as the principle growth regulator in higher plants; called also heteroauxin. Abbreviated IAA. Chemically it is 1H-indole-3-acetic acid.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a plant hormone promoting elongation of stems and roots
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