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A slender bristle, especially one at the tip of a glume or lemma in a grass spikelet.
(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]
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]