gibberellic acid

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

• noun A plant hormone, C₁₉H₂₂O₆, that promotes processes such as seed germination, flowering, and stem elongation. It is also present in certain fungi.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A plant growth hormone of the gibberellin series (C19H22O6), also called gibberellin A3. It was first isolated from the fungus Gibberella fujikuroi. It is used to promote the growth of seedlings. See also gibberellin.

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

• noun biochemistry, organic chemistry An organic compound, one of the gibberellins, obtained from the fungus Gibberella fujikuroi, that functions as a growth hormone in plants.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a crystalline acid associated with gibberellin