auxin

[ awk-sin ]

/ ˈɔk sɪn /

Save This Word!

noun Biochemistry.

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.

QUIZ

WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?

Smoothly step over to these common grammar mistakes that trip many people up. Good luck!

Question 1 of 7

Fill in the blank: I can’t figure out _____ gave me this gift.

who

whom

TAKE THE QUIZ TO FIND OUT

Origin of auxin

First recorded in 1930–35; aux- + -in²

OTHER WORDS FROM auxin

aux·in·ic, adjective

Words nearby auxin

auxiliary rafter, auxiliary rotor, auxiliary tone, auxiliary verb, auxilytic, auxin, Auxo, auxocardia, auxochrome, auxocyte, auxospore

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use auxin in a sentence

The hormones, auxin and cytokinin, induced the zinnia cells to produce lignin, a polymer that makes wood firm.
No Trees Harmed: MIT Aims to One Day Grow Your Kitchen Table in a Lab|Jason Dorrier|January 24, 2021|Singularity Hub

British Dictionary definitions for auxin

auxin

/ (ˈɔːksɪn) /

noun

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 for auxin

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

Scientific definitions for auxin

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.