Webster's English Dictionary

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nitroglycerin

ni.tro.glyc.er.in or ni.tro.glyc.er.ine \.ni--tro--'glis-(*-)r*n\ n [ISV] : 
   a heavy oily explosive poisonous liquid C3H5(ONO2)3  obtained by nitrating 
   glycerol and used chiefly in making dynamites and in medicine as a 
   vasodilator