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a slightly soluble crystalline plant hormone first isolated from the fungus Gibberella fujikuroi : a gibberellin. Formula: C 19 H 22 O 6

A plant hormone that promotes growth and that is the most important of the gibberellins. It is used commercially to break dormancy of plants, promote germination, and increase or retard the development of fruit. Gibberellic acid is also a metabolic byproduct of certain fungi. Chemical formula: C ₁₉ H ₂₂ O ₆ .