You searched for: “troglophobia”
troglophobia (s) (noun), troglophobias (pl)
An abnormal panic of being in cavities or chambers in the ground: Spelunkers certainly don't have troglophobias or they couldn't survive during their explorations.
This entry is located in the following units: phobo-, phob-, -phobia, -phobias, -phobe, -phobiac, -phobist, -phobic, -phobism, -phobous (page 41) troglo-, trogl- (page 2)