follow Dictionary.com

Stories We Like: Novels For Language Lovers

auxin

[awk-sin] /ˈɔk sɪn/
noun, Biochemistry
1.
a class of substances that in minute amounts regulate or modify the growth of plants, especially root formation, bud growth, and fruit and leaf drop.
Origin
1930-1935
1930-35; aux- + -in2
Related forms
auxinic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for auxin

auxin

/ˈɔːksɪn/
noun
1.
any of various plant hormones, such as indoleacetic acid, that promote growth and control fruit and flower development. Synthetic auxins are widely used in agriculture and horticulture
Word Origin
C20: from Greek auxein to grow
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
Cite This Source
Word Origin and History for auxin
n.

plant growth hormone, 1934, from German (1931), from Greek auxein "to increase" (see augment) + chemical suffix -in (2).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
auxin in Science
auxin
  (ôk'sĭn)   
Any of various hormones or similar substances that promote and regulate the growth and development of plants. Auxins are produced in the meristem of shoot tips and move down the plant, causing various effects. Auxins cause the cells below the shoot apex to expand or elongate, and this (rather than cell division) is what causes the plant to increase in height. In woody plants, auxins also stimulate cell division in the cambium, which produces vascular tissue. Auxins inhibit the growth of lateral buds so that the plant grows upwards more than outwards. They can be produced artificially in laboratories for such purposes as speeding plant growth and regulating how fast fruit will ripen.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for auxin

Some English speakers likely know this word

Word Value for auxin

12
14
Scrabble Words With Friends

Nearby words for auxin