Definition of auxin noun from the Oxford Advanced Learner's Dictionary

 

auxin

 noun
noun
BrE BrE//ˈɔːksɪn//
 
; NAmE NAmE//ˈɔːksɪn//
 
[uncountable]
 
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a hormone found in plants Word Origin 1930s: coined in German from Greek auxein ‘to increase’ + -in.
See the Oxford Advanced American Dictionary entry: auxin