gibberellic acid

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A hormone, C₁₉H₂₂O₆, obtained from the fungus Gibberella fujikuroi and used to promote the growth of plants, especially seedlings.

Wiktionary

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

GNU Webster's 1913

1. n. (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.

WordNet 3.0

1. n. a crystalline acid associated with gibberellin