any uncultivated species of Avena, especially a common weedy grass, A. fatua, resembling the cultivated oat.
2.
a hardy plant, Uvularia sessilifolia, of the lily family, of eastern North America, having deep green, hairy leaves and greenish-yellow, tubular flowers.
Idioms
3.
sow one's wild oats, to have a youthful fling at reckless and indiscreet behavior, especially to be promiscuous before marriage.
Origin
1490-1500
Examples from the web for wild oat
Two weeds receiving attention are leafy spurge and wild oat.
The family grew their own barley and wheat, and harvested wild oat hay.
Forage leys provide excellent wild oat control, especially when used in conjunction with zero-tillage.
British Dictionary definitions for wild oat
wild oat
noun
1.
any of several temperate annual grasses of the genus Avena, esp A. fatua, that grow as weeds and have long bristles on their flower spikes
Encyclopedia Article for wild oat
any of several tufted annual grasses of the genus Avena (family Poaceae), native to Eurasia. Wild oats are sometimes cut for hay, and young plants provide forage for grazing animals
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