ferment

[n. fur-ment; v. fer-ment]
noun
1.
Also called organized ferment. any of a group of living organisms, as yeasts, molds, and certain bacteria, that cause fermentation.
2.
Also called unorganized ferment. an enzyme.
4.
agitation; unrest; excitement; commotion; tumult: The new painters worked in a creative ferment. The capital lived in a political ferment.
verb (used with object)
5.
to act upon as a ferment.
6.
to cause to undergo fermentation.
7.
to inflame; foment: to ferment prejudiced crowds to riot.
8.
to cause agitation or excitement in: Reading fermented his active imagination.
verb (used without object)
9.
to be fermented; undergo fermentation.
10.
to seethe with agitation or excitement.

Origin:
1350–1400; Middle English < Latin fermentum yeast (noun), fermentāre to cause to rise (v.); akin to barm, Latin fervēre to boil

fermentable, adjective
fermentability, noun
nonfermentability, noun
nonfermentable, adjective
nonfermented, adjective
nonfermenting, adjective
unfermentable, adjective
unfermented, adjective
unfermenting, adjective
well-fermented, adjective

ferment, foment.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ferment
 
n
1.  any agent or substance, such as a bacterium, mould, yeast, or enzyme, that causes fermentation
2.  another word for fermentation
3.  commotion; unrest
 
vb
4.  to undergo or cause to undergo fermentation
5.  to stir up or seethe with excitement
 
[C15: from Latin fermentum yeast, from fervēre to seethe]
 
 
fer'mentable
 
adj
 
fermenta'bility
 
n
 
fer'menter
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ferment
late 14c., from L. fermentare "to leaven, ferment," from fermentum "substance causing fermentation, leaven," from root of fervere "to boil, seethe" (see brew). Related: Fermented; fermenting.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ferment fer·ment (fûr'měnt')
n.

  1. An agent, as a yeast, a bacterium, a mold, or an enzyme, that causes fermentation.

  2. Fermentation.

v. fer·ment·ed, fer·ment·ing, fer·ments (fər-měnt')
To cause or undergo fermentation.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He said fruit juices and liquid honey in a temperate climate would easily ferment, allowing for the production of alcohol.
Their digestive enzymes ferment the beans and break down the proteins.
Then, you'll need to ferment something starchy or sugary to get some alcohol.
In the end, though, the ferment caused by these revelations may work to the
  advantage of the spooks.
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