Awn definitions

ôn
A slender bristle, especially one at the tip of a glume or lemma in a grass spikelet.
noun
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Any bristlelike fiber or fibers, as on the head of barley, oats, or wheat; beard.
noun
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A slender, bristlelike appendage found on the spikelets of many grasses.
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The bristle or beard of barley, oats, grasses, etc., or any similar bristlelike appendage; arista.
noun
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Origin of awn

Middle English aw(u)ne, agune, agene, from Old Danish aghn (compare modern avne), from Proto-Germanic *aganō, *ahanō 'chaff' (compare Old English ægnan, Frisian/Dutch agen, German Ahne, Agen), from Proto-Indo-European *aḱanā (compare Old Latin agna 'ear of wheat', Lithuanian ašnìs, Czech osina, Ancient Greek ἄκαινα (ákaina, “spike, prick”), ἄκανος (ákanos, “pine-thistle”), Sanskrit अशनि (aśáni, “thunderbolt, arrow tip”), from Proto-Indo-European *h₂eḱ (“sharp”). More at edge.