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indoleacetic acid

American  
[in-dohl-uh-see-tik, -set-ik, in-] / ˈɪn doʊl əˈsi tɪk, -ˈsɛt ɪk, ˌɪn- /

noun

Biochemistry.

  1. a crystalline, water-insoluble powder, C 10 H 9 NO 2 , a natural plant hormone, used especially for stimulating growth and root formation in plant cutting.

indoleacetic acid British  
/ -ˈsɛtɪk, ˌɪndəʊləˈsiːtɪk /

noun

  1.  IAA.  an auxin that causes elongation of the cells of plant stems. Formula: C 10 H 9 NO 2

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of indoleacetic acid

First recorded in 1885–90; indole + acetic

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.