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auxin Line breaks: auxin
Pronunciation: /ˈɔːksɪn/

Definition of auxin in English:


[mass noun]
A plant hormone which causes the elongation of cells in shoots and is involved in regulating plant growth. See also indoleacetic acid. the apex of a growing stem produces auxin [count noun]: gibberellin interacts with cytokinins and auxins
More example sentences
  • Falling levels of plant hormones such as auxin and the cytokinins are responsible.
  • Hormones such as auxins and gibberellins trigger fruit cells to expand.
  • New links to the plant hormone, auxin, were also uncovered.


1930s: coined in German from Greek auxein 'to increase' + -in1.

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