Webster’s Revised Unabridged Dictionary · 1913
Sol-fa
Sol′-fa′ (sōl′fä′), 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.
Sol′-fa′, n. The gamut, or musical scale. See Tonic sol-fa, under Tonic, n.