su·per·flu·ous (sŏŏ-pûr'flōō-əs) adj. Being beyond what is required or sufficient.
[Middle English, from Old French superflueux, from Latin superfluus, from superfluere, to overflow : super-, super- + fluere, to flow; see bhleu- in Indo-European roots.] su·per'flu·ous·ly adv., su·per'flu·ous·ness n.
Synonyms: These adjectives mean being more than is needed, desired, required, or appropriate: delete superfluous words; trying to lose excess weight; found some extra change on the dresser; sleeping in the spare room; supernumerary ornamentation; distributed surplus food to the needy.
c.1380 (superflue), from L. superfluus "unnecessary," lit. "overflowing," from superfluere "to overflow," from super "over" (see super-) + fluere "to flow" (see fluent).