hysteric

Concise Oxford English Dictionary © 2008 Oxford University Press:
hysteric/hɪˈstɛrɪk/

▶noun

• 1 (hysterics) informal wildly emotional behaviour.

  ■ uncontrollable laughter.

• 2 a person suffering from hysteria.

▶adjective another term for hysterical.

– origin C17: via L. from Gk husterikos ‘of the womb’, from hustera ‘womb’ (hysteria being thought to be assoc. with the womb).