Webster's Revised Unabridged Dictionary · 1913

Sol-fa

Sol-fa , intransitive verb

[Italian 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 , transitive verb

To sing to solmization syllables.

Sol-fa , noun

The gamut, or musical scale. See Tonic sol-fa, under Tonic, n.