Nitroglycerin (NG), (United States spelling) also known as nitroglycerine, (UK Spelling), trinitroglycerin, trinitroglycerine, 1,2,3-trinitroxypropane and glyceryl trinitrate, is a heavy, colorless, oily, explosive liquid obtained by nitrating glycerol.    From Wordnik.com.  [MetaFilter Projects] Reference