What is "trifluoromethanesulfonic acid"

n. (context organic compound English) The very strong sulfonic acid CF₃SO₃H that is used in organic synthesis, where it is known as triflic acid

Trifluoromethanesulfonic acid, also known as triflic acid, TFMS, TFSA, HOTf or TfOH, is a sulfonic acid with the chemical formula CFSOH. It is one of the strongest acids. Triflic acid is mainly used in research as a catalyst for esterification. It is a hygroscopic, colorless, slightly viscous liquid which is soluble in polar solvents.