from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several plant hormones that regulate various functions, including cell elongation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A class of plant growth substance (often called phytohormones or plant hormones) which play an essential role in coordination of many growth and behavioral processes in the plant life cycle.
from the GNU version of the Collaborative International Dictionary of English
- n. a substance which, in small concentrations, promotes root formation, bud growth, or certain other processes such as fruit ripening or leaf drop in plants.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a plant hormone that promotes root formation and bud growth
From Greek auxein, to grow; see aug- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek αὐξάνειν (auxanein, "to grow"). (Wiktionary)