Gerund form functioning as an uncountable noun meaning the act or sound of ululating.
ululatinggerundium / partizip präsens Used attributively to describe a continuous wailing or howling sound.
The ululating crowd filled the stadium with an eerie sound.
Вопящая толпа наполнила стадион жутким звуком.
The ululating wind made the night feel even more ominous.
Завывающий ветер делал ночь ещё более зловещей.