What is Shrieking?

Shrieking definition and meaning on Dictionary terms:
a loud, sharp, shrill cry.
a loud, high sound of laughter.

any loud, shrill sound, as of a whistle.

verb (used without object)
to utter a loud, sharp, shrill cry, as birds.
to cry out sharply in a high voice: to shriek with pain.
to utter loud, high-pitched sounds in laughing.

(of a musical instrument, a whistle, the wind, etc.) to give forth a loud, shrill sound.

verb (used with object)
to utter in a shriek: to shriek defiance.