auxin: Meaning and Definition of

aux•in

Pronunciation: (ôk'sin), [key]
— n. Biochem.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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