A plural form referring to auxins or plant hormones (the term comes from transliterated Greek or scientific nomenclature).
From Greek 'auxein' meaning 'to grow.' This appears to be either a variant or transliterated form of 'auxins,' the plant growth hormones discovered in the early 20th century.
Plant hormones called auxins were discovered when scientists noticed plants bend toward light—they found a chemical message traveling from the tip of the plant that tells cells to stretch, which is literally how plants 'decide' to grow.
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