Source : Webster's Revised Unabridged Dictionary (1913)

Ululate \Ul"u*late\, v. i. [imp. & p. p. {Ululated}; p. pr. &
   vb. n. {Ululating}.] [L. ululatus, p. p. of ululare to howl,
   yell, shriek.]
   To howl, as a dog or a wolf; to wail; as, ululating jackals.
   --Sir T. Herbert.