beta-indolylacetic acid
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auxin — auxinic, adj. /awk sin/, n. Biochem. a class of substances that in minute amounts regulate or modify the growth of plants, esp. root formation, bud growth, and fruit and leaf drop. [1930 35; AUX + IN2] * * * Any of a group of hormones that… … Universalium
hormone — hormonal, hormonic /hawr mon ik, moh nik/, adj. /hawr mohn/, n. 1. Biochem. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues… … Universalium