AUXIN
- a substance used to regulate plant growth [n AUXINS] : AUXINIC [adj]
- any of various usually acidic organic substances that promote cell elongation in plant shoots and usually regulate other growth processes (as root initiation) as
- ant hormone
- class of substances that in minute amounts regulate or modify the growth of plants, esp. root formation, bud growth, and fruit and leaf drop
- a growth promoting substance [n -S]