a. Obs. [f. FLUOR + -OUS.] Only in fluorous acid: (see quot. 1828: no such acid exists).
1790. R. Kerr, trans. Lavoisier’s Elem. Chem., 185 (Table). Fluorous acid.
1828. Webster, s.v. (citing Lavoisier), The fluorous acid is the acid of fluor in its first degree of oxygenation.
