ˈȯksə̇n noun
( -s )
Etymology: International Scientific Vocabulary aux- (from Greek auxein to increase) + -in — more at eke
: any organic substance (as indoleacetic acid) characterized by its ability in low concentrations to promote growth of plant shoots along the longitudinal axis (as in the Avena test) and to produce various other effects (as root formation and bud inhibition) — compare plant hormone
• aux·in·ic (ˈ)ȯk|sinik or aux·in·i·cal -nə̇kəl adjective
• aux·in·i·cal·ly -ə̇k(ə)lē adverb