leaven

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leaven

(lĕv`ən), agent used to raise bread or other flour foods. Physical leavens include water vapor, which is released as steam at high temperatures (as in popovers), and air, which is incorporated by beating. Chemical leaven (baking powder and baking soda) and biological leavens (yeasts and certain bacteria) raise the mixture by the formation of carbon dioxide gas, which is expanded by heat. Some of the earliest leavens were barm, a yeast of fermenting malt liquor, and sourdough, a portion saved from a mass of dough as a starter for the next batch.

leaven

[′lev·ən;]
(food engineering)
A substance (such as yeast) used to produce fermentation.
A substance such as yeast or baking powder used to produce a gas to lighten dough.

leaven

1. any substance that produces fermentation in dough or batter, such as yeast, and causes it to rise
2. a piece of such a substance kept to ferment a new batch of dough
References in periodicals archive ?
Breads leavened with baking powder were found to have significantly lower water activity compared to breads leavened with yeast.
The deal is happily declared to be off, and the leavened riches officially return to their previous owners.
On the other hand, naturally fermented breads are leavened over a long period of time (8-10 hours) by the action of wild yeast spores (lactobacillus) drawn into a starter-leaven from the air.
According to the long-awaited preamble to the European constitution, Europe's history is leavened by a "spiritual impulse," but God is nowhere to be found in the document.
Bush may represent something new, a combination of Lyndon Johnson's romantic attachment to Israel leavened by an awareness of the hard geopolitical realities.
Writing in a strong, assertive, declamatory voice, uncompromising in his racial pride, Davis often leavened his poems with flashes of lyricism as well as with wit and mordant satire--as in the sequence of poems entitled "Ebony Under Satire" that appeared in both Black Man's Verse and his second collection, I Am the American Negro.
Instead, unlike leavened bread that rises, the story remains flat.
Now that gingerbread and Yule log recipes have been returned to their rightful place, the idea of spring begs a feature on leavened ingredients, so why not brioche?
The main points of conflict were papal claims to universal supremacy in the church, the Western insistence in its creed that the Holy Spirit "proceeds from the Father and the Son"--rather than from the Father only--and whether eucharistic bread should be unleavened or leavened (most Eastern churches use leavened bread).
Also an organic farm, Shelburne produces cheddar cheese from its own chemical-tree milk, and makes sourdough bread from organically grown grain, leavened with natural sourdough.
The collection is leavened by the inclusion of Baron, Kristeller, Mattingly and Burckhardt.
There is a despairing vision that runs throughout, only partially leavened by the jazz and the sex.