WordNet (r) 3.0 (2006):

Molisch test
    n 1: biochemical indicator of the presence of carbohydrates in a
         solution; if carbohydrates are present a violet ring is
         formed by reaction with alpha-naphthol in the presence of
         sulfuric acid [syn: alpha-naphthol test, Molisch's
         test, Molisch test, Molisch reaction]