auxin

aux·in

noun \ˈȯk-sən\

Definition of AUXIN

1

: 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

2

: plant hormone

— aux·in·ic \ȯk-ˈsi-nik\ adjective

Origin of AUXIN

International Scientific Vocabulary, from Greek auxein to increase — more at eke

First Known Use: 1934