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Any of three crystalline isomeric acids, C8H8O2, derived from toluene.
(Elements & Compounds) a white crystalline derivative of toluene existing in three isomeric forms; methylbenzoic acid. The ortho- and para- isomers are used in synthetic resins and the meta- isomer is used as an insect repellent. Formula: C6H4CH3COOH
[C19: from tolu(ene) + -ic]