Metol Syllabification: (Me·tol)Pronunciation: /ˈmeˌtôl, -ˌtōl/Definition of Metol noun trademark a soluble white compound used as a photographic developer. A sulfate of 4-methylaminophenol (chemical formula: CH3NHC6H4OH) Origin: late 19th century: from German, arbitrarily named by the inventor
