Definition of "auxin" []

• Any of several plant hormones that regulate various functions, including cell elongation. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "When a terminal bud or growing tip is removed from the parent plant, a growth-suppression hormone called auxin is removed as well."
• "Arabidopsis thaliana that are defective in the formation of continuous vascular network: calling the auxin signal flow canalization hypothesis into question."
• "Building on previous observations, a group of scientists in the Department of Gerd Jürgens at the Max Planck Institute for Developmental Biology, together with scientists in Belgium, described the necessity of combining increased cell cycle activity and auxin, which is one of the major plant hormones, to give rise to an increase in root branching."