"bristly fibers on grain of plants," c. 1300, from Old Norse ögn, from Proto-Germanic *agano (source also of Old English egenu, Old High German agana, German Ahne, Gothic ahana), from PIE *ak-ona- (source also of Sanskrit asani- "arrowhead," Greek akhne "husk of wheat," Latin acus "chaff," Lithuanian akuotas "beard, awn"); suffixed form of root *ak- "be sharp, rise (out) to a point, pierce."
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