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Any of a class of plant hormones that promote cell division and growth and delay the senescence of leaves.
(Botany) any of a group of plant hormones that promote cell division and retard ageing in plants. Also called: kinin
cy•to•ki•nin(ˌsaɪ təˈkaɪ nɪn)
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.