ululation (n.) Look up ululation at Dictionary.com
1590s, from Latin ululationem (nominative ululatio) "a howling or wailing," noun of action from past participle stem of ululare "to howl, yell, shriek, wail, lament loudly," from a reduplicated imitative root (cognates: Greek ololyzein "to cry aloud," Sanskrit ululih "a howling," Lithuanian uluti "howl," Gaelic uileliugh "wail of lamentation," Old English ule "owl").