Source : Webster's Revised Unabridged Dictionary (1913)

Roulade \Rou`lade"\, n. [F.] (Mus.)
   A smoothly running passage of short notes (as semiquavers, or
   sixteenths) uniformly grouped, sung upon one long syllable,
   as in Handel's oratorios.

Source : WordNet®

roulade
     n 1: a dish consisting of a slice of meat that is rolled around a
          filling and cooked
     2: (music) an elaborate run of several notes sung to one
        syllable