an acid, CHO, isolated from various fungi and other plants, and used to increase the growth of plants and seedlings and to improve the yield of certain fruit-bearing plants
See gibberellic acid in American Heritage Dictionary 4
(jĭbˌə-rĕlˈĭk)
noun
A hormone, C19H22O6, obtained from the fungus Gibberella fujikuroi and used to promote the growth of plants, especially seedlings.