Source : Webster's Revised Unabridged Dictionary (1913)

Sol-fa \Sol`-fa"\, v. i. [imp. & p. p. {Sol-faed};p. pr. & vb.
   n. {Sol-faing}.] [It. solfa the gamut, from the syllables fa,
   sol.]
   To sing the notes of the gamut, ascending or descending; as,
   do or ut, re, mi, fa, sol, la, si, do, or the same in reverse
   order.

         Yet can I neither solfe ne sing.         --Piers
                                                  Plowman.