Etymology
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auxin (n.)

plant growth hormone, 1934, from German (1931), from Greek auxein "to increase" (from PIE root *aug- (1) "to increase") + chemical suffix -in (2).

updated on April 09, 2017

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Definitions of auxin from WordNet

auxin (n.)
a plant hormone that promotes root formation and bud growth;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.