| ̷ ̷ ̷ ̷ˌ ̷ ̷| ̷ ̷| ̷ ̷ ̷ ̷- noun
Etymology: toluene + sulfonic
: any of three isomeric crystalline oily liquid strong acids CH 3 C 6 H 4 SO 3 H of which the para and ortho isomers are obtained in a mixture by sulfonation of toluene and used in organic synthesis (as of dyes)