A chemical substance or nutrient that promotes or enhances growth and development in organisms, functioning as a growth-stimulating agent.
From 'auxo-' (growth) and 'substance' (matter). The term developed in biochemistry to describe any material or compound that facilitated organismal growth beyond basic nutrients.
Auxosubstances are like growth fuel—fertilizers, vitamins, and plant hormones all fall into this category. Understanding what auxosubstances plants need helped agriculture transform from guesswork into science.
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