wild oat

noun
1.
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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wild oat
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

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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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
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.
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