Definition from Wiktionary, the free dictionary
- IPA: /hɪ ˈstɛrɪkəl/
- Of, or arising from hysteria.
- Having, or prone to having hysterics.
- Provoking uncontrollable laughter.
Usage notes 
- Like many terms that start with a (non-silent) h and have emphasis on their second syllable, some people precede hysterical with an, others with a.
Related terms 
arising from hysteria
prone to having hysterics