Dictionary![]() ![]() wild' oat'1. any uncultivated species of Avena, esp. 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. 3. sow one's wild oats, to have a youthful fling at reckless and indiscreet behavior, esp. to be promiscuous before marriage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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