IPA: //klɔːstrəˈfoʊbɪk//
KK: /klɔːstrəˈfoʊbɪk/
Feeling uncomfortable or anxious in small or closed spaces.
She felt claustrophobic in the crowded elevator.
A person who has a strong fear of being in small or enclosed spaces.
She is claustrophobic and feels anxious in elevators.
Claustrophobic 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 claustrophobic refers to the fear of being in closed spaces.