awn Syllabification: (awn)Pronunciation: /ôn/Definition of awn noun Botany a stiff bristle, especially one of those growing from the ear or flower of barley, rye, and many grasses. Derivatives awned adjective Origin: Old English, from Old Norse ǫgn; related to Swedish agn, Danish avnawn in other Oxford dictionaries Definition of awn in the British & World English dictionary