Leav·en, v. t. [imp. & p. p. Leavened p. pr. & vb. n. Leavening ]
1. To make light by the action of leaven; to cause to ferment.
A little leaven leaveneth the whole lump. --1 Cor. v. 6.
2. To imbue; to infect; to vitiate.
With these and the like deceivable doctrines, he leavens also his prayer. --Milton.
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leavened
adj : made light by aerating, as with yeast or baking powder;
often used as a combining form; "leavened bread";
"well-leavened"; "yeast-leavened breads" [ant: unleavened]