\ UL-yuh-layt; YOOL- \ , intransitive verb;
1. To howl, as a dog or a wolf; to wail; as, ululating jackals.
She used harrowing, penetrating nasal tones and a rasp that approached Janis Joplin’s double-stops; shemade notes break and ululate.
— Jon Pareles, “On the Third Day There Was Whooping and There Was Moshing”, New York Times , August 18, 1998
Ululate derives from Latin ululare, to howl, to yell, ultimately of imitative origin. The noun form is ululation; the adjective form is ululant.