American Heritage® Dictionary of the English Language, Fourth Edition
- n. A plant hormone, C10H9NO2, that stimulates growth.
- n. organic chemistry an auxin plant hormone, synthesized in leaves, that stimulates growth, especially in the presence of ethylene
GNU Webster's 1913
- n. (Chem., Bot.) 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.
- n. a plant hormone promoting elongation of stems and roots
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