Brewing Glossary
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lactic acid
An organic acid sometimes used to assist the acidification of the mash. Also, a by-product of Lactobacillus.
 
Lactobacillus
Large class of aerobic bacteria. May be either a spoilage organism, or a consciously added fermenting agent in Kolsch, or Berliner weisse.
 
lactophilic
An organism that metabolizes lactate more readily than glucose.
 
lactose
A disaccharide derived from milk. Unfermentable by yeast, it is used as a sweetener in milk stout.
 
lager
"To store." A long, cold period of subdued fermentation and sedimentation to active (primary) fermentation. Any beer produced with bottom-fermenting or lager yeast.
 
lager yeast
Saccharmyces uvarum Fermentation temperatures between 33 - 50 °F (1 - 10 °C).
 
lambic
A highly distinctive wheat ale made in Belgium. Brewed with wild yeast and beer souring bacteria. Lambics have a sharp, tart taste, and usually flavored with fruit.
 
lauter
The thin mash after saccharification; the sweet mash liquor.
 
lauter tun
A vessel used to separate spent grains or draff from the lauter. This vessel is typically fitted with a false bottom that holds the grain bed during sparging. Also called the sparging vessel.
 
light-struck flavor
Having the characteristic smell of a skunk, caused by exposure to light. Some hops can have a very similar character.
 
lintner
The commonly used European standard measurement of diastatic activity. Expressed in °Lintner.
 
lipids
Fatty substances that compose about 3 percent of malt. Fat like substances, especially triacylglycerols and fatty acids that composes about 3 percent of the malt. Affects the ability of beer to form a foam head. Upon decomposition can contribute to stale flavors.
 
liquor
The name given in the brewing to water used for mashing and brewing.
 
lock
Small water-filled device used on a carboy. See fermentation lock.
 
lovibond
A standard scale for the measurement of grain wort and beer color. A particular sample is characterized with a Lovibond rating by comparing it to a standard liquid reference sample. Malt is as signed a Lovibond rating by producing a sample wort from a single malt grist and comparing the result to the standard color reference samples. Expressed in °Lovibond.
 
lupulin
The resiny substance in hops containing all the resins and aromatic oils.
 


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