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Any of several plant hormones, such as gibberellic acid, that stimulate stem elongation, seed germination, and other physiological processes.
[From New Latin Gibberella (fujikoroī), the fungus from which a gibberellin was first isolated, from Latin gibberella, feminine diminutive of gibber, hump (from the humplike shape of the genus's perithecia).]
(Botany) any of several plant hormones, including gibberellic acid, whose main action is to cause elongation of the stem: used in promoting the growth of plants, in the malting of barley, etc
gib•ber•el•lin(ˌdʒɪb əˈrɛl ɪn)
any of a class of growth hormones occurring in fungi and plants.
[1935–40; < New Latin Gibberella]