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IBU

An estimate of the beers bitterness.Same as International Bittering Units (see below).

 

Imperial Stout

See Russian Stout.

India Pale Ale

An ale brewed in England for British troops stationed in India in the 18th century. It was brewed very strong to survive a voyage that could take as long as six months. Highly hopped.

Initial heat

The first temperature the beer hits when the grains are added to the hot water.

International Bittering Units

One Bitterness Unit is equal to 1 milligram of iso(merized) alpha acid in one liter of wort of beer.

Irish Red Ale

An Irish ale, noted for its reddish color, full body, and sweetish, sometimes buttery palate.