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gibberellin

[jib-uh-rel-in] /ˌdʒɪb əˈrɛl ɪn/
noun, Biochemistry
1.
any of a class of growth hormones occurring in fungi and plants.
Origin
1935-1940
1935-40; < Neo-Latin Gibberell(a) (see gibberellic acid) + -in2
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for gibberellin

gibberellin

/ˌdʒɪbəˈrɛlɪn/
noun
1.
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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gibberellin in Science
gibberellin
  (jĭb'ə-rěl'ĭn)   
Any of numerous plant hormones, especially gibberellic acid, that promote stem elongation. The seeds, young shoots, and roots of plants contain gibberellins, and they are also found in fungi.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for gibberellin

any of a group of plant hormones that occur in seeds, young leaves, and roots. The name is derived from Gibberella fujikuroi, a hormone-producing fungus in the phylum Ascomycota (kingdom Fungi). Evidence suggests that gibberellins stimulate the growth of main stems, especially when applied to the whole plant. They also promote the growth of dwarf peas and are involved in the bolting (elongation) of rosette plants (e.g., the carrot) after such plants have been exposed to certain environmental stimuli (e.g., cold or long periods of daylight). Gibberellic acid, a gibberellin, is found in both higher plants and fungi.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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