IPA: //klɔːstrəˈfoʊbiə//
KK: /klɔːstrəˈfoʊbiə/
A strong fear of being in small or closed spaces, which can cause anxiety and panic.
She felt a wave of panic due to her claustrophobia when the elevator doors closed.
Claustrophobia is formed from "claustrum" (from Latin, meaning a closed space or enclosure) and "phobia" (from Greek "phobos", meaning fear). The word describes the fear of closed or confined spaces.
Think of 'claustrum' meaning a closed space, and 'phobia' meaning fear — this helps you remember that claustrophobia is the fear of being in closed spaces.