Superfluous \Su*per"flu*ous\, a. [L. superfluus overflowing; super over, above + fluere to flow. See Super-, and Fluent.]

More than is wanted or is sufficient; rendered unnecessary by superabundance; unnecessary; useless; excessive; as, a superfluous price. --Shak.

An authority which makes all further argument or illustration superfluous. --E. Everett.

Superfluous interval (Mus.), an interval that exceeds a major or perfect interval by a semitone.

Syn: Unnecessary; useless; exuberant; excessive; redundant; needless. -- Su*per"flu*ous*ly, adv. -- Su*per"flu*ous*ness, n.

Source: Webster's Revised Unabridged Dictionary (1913)