• (n.) The hydrocarbon radical, CH3.C6H4, regarded as characteristic of certain compounds of the aromatic series related to toluene; as, tolyl carbinol. Found on http://thinkexist.com/dictionary/meaning/tolyl/
Tol'yl noun [ Tol uic + -yl .] (Chemistry) The hydrocarbon radical, CH 3 .C 6 H 4 , regarded as characteristic of certain compounds of the aromatic series related to toluene; as, tolyl carbinol. Found on http://www.encyclo.co.uk/webster/T/66