leavening-agent

leavening

[lev-uh-ning]
noun
1.
Also called leavening agent. a substance used to produce fermentation in dough or batter; leaven.
2.
the act or process of causing to ferment by leaven.
3.
leaven ( def 3 ).

Origin:
1600–10; leaven + -ing1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

leaven
mid-14c., from O.Fr. levain (12c.), from L. levamen "alleviation, mitigation," but used in V.L. in its literal sense of "a means of lifting, something that raises," from levare "to raise" (see lever). The verb is attested from early 15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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