Wordnet 3.0
NOUN (1)
1. 
 any of a class of plant hormones that promote cell division and delay the senescence of leaves; 
[syn: kinin, cytokinin]
WordNet (r) 3.0 (2006):
kinin
    n 1: any of a class of plant hormones that promote cell division
         and delay the senescence of leaves [syn: kinin,
         cytokinin]