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[sahy-tuh-kahy-nin] /ˌsaɪ təˈkaɪ nɪn/
noun, Biochemistry
any of a class of plant hormones, produced by the roots and traveling upward through the xylem, that promote tissue growth and budding and, on application, retard plant senescence.
Compare kinetin, zeatin.
1960-65; cyto- + -kinin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for cytokinin


any of a group of plant hormones that promote cell division and retard ageing in plants Also called kinin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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cytokinin in Science
Any of a class of plant hormones that promote cell division and growth and delay the senescence of leaves. Cytokinins are synthesized mainly in root tips.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for cytokinin

any of a number of plant growth substances that are usually derived from adenine. Synthesized in roots, cytokinins move upward in the xylem (woody tissue) and pass into the leaves and fruits, where they are required for normal growth, for cell differentiation, and, in conjunction with auxin (another plant hormone), to promote cell division.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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