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A slender bristle, especially one at the tip of a glume or lemma in a grass spikelet.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Botany) any of the bristles growing from the spikelets of certain grasses, including cereals
[Old English agen ear of grain; related to Old Norse ögn chaff, Gothic ahana, Old High German agana, Greek akōn javelin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a bristlelike appendage of a plant, esp. on the glumes of grasses.
2. any similar bristle.
[1250–1300; Middle English aw(u)n, agune, agene, probably < Scandinavian; compare Old Norse ǫgn, husk; Old English ægnan, c. Old High German agana, Gothic ahana, Old Latin agna ear of grain]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.