ul·u·late 
(ŭlyə-lāt′, yl-)
(ŭlyə-lāt′, yl-)intr.v. ul·u·lat·ed, ul·u·lat·ing, ul·u·lates
To howl, wail, or lament loudly, especially by alternating rapidly between two high-pitched sounds.
[Latin ululāre, ululāt-, ultimately of imitative origin.]
ulu·lant (-lənt) adj.
ul′u·lation n.