noun
: an oily flame-resistant mixture of isomeric inorganic esters (CH 3 C 6 H 4 ) 3 PO 4 made from cresols or cresylic acid and usually phosphorus oxychloride and used chiefly as a plasticizer and solvent, as a fire retardant, and as a lead scavenger in gasoline : tritolyl phosphate — not used systematically