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]