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| Quadraphobia | fear of the number four (see list of phobias) | ||
| Quadriplegiphobia | fear of quadriplegics or fear of becoming a quadriplegic (see list of phobias) | ||
| Quinology | study of quinine. (see list of branches of science) | ||
| Quintaphobia | fear of the number five (see list of phobias) | ||
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