In chemistry, denoting an element or radical, only one atom or unit of which is found in each molecule of a substitution compound. ... (05 Mar 2000) ... 
Type: Term Pronunciation: mon′ō-sŭb′sti-tū′tĕd Definitions: 1. chemistry denoting an element or radical, only one atom or unit of which is found in each molecule of a substitution compound.
containing one substituent.