Etymology
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claustrophobia (n.)

"morbid fear of being shut up in a confined space," coined 1879 (in article by Italian-born, French-naturalized Swiss-English physician Dr. Benjamin Ball), with -phobia "fear" + Latin claustrum "a bolt, a means of closing; a place shut in, confined place, frontier fortress" (in Medieval Latin "cloister"), from past participle of claudere "to close" (see close (v.)).

updated on December 18, 2017

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Definitions of claustrophobia from WordNet

claustrophobia (n.)
a morbid fear of being closed in a confined space;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.