noun aux·in \ˈk-sən\

Definition of AUXIN

:  any of various usually acidic organic substances that promote cell elongation in plant shoots and usually regulate other growth processes (as root initiation): as
a :  indoleacetic acid
b :  any of various synthetic substances (as 2,4-D) resembling indoleacetic acid in activity and used especially in research and agriculture
aux·in·ic \k-ˈsi-nik\ adjective

Origin of AUXIN

International Scientific Vocabulary, from Greek auxein to increase — more at eke
First Known Use: 1933


noun aux·in \ˈk-sən\   (Medical Dictionary)

Medical Definition of AUXIN

:  an organic substance that is able in low concentrations to promote elongation of plant shoots and usually to control other specific growth effects; broadly :  plant hormone


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