The English suffixes -phobia, -phobic, -phobe (of Greek origin) occur in technical usage in psychiatry to construct words that describe irrational, disabling fear as a mental disorder (e.g., agoraphobia), in chemistry to describe chemical aversions (e.g., hydrophobic), and in biology to descibe organisms that dislike certain conditions (e.g., acidophobia). In common usage they also form words that describe dislike or hatred of a particular thing or subject.
Many people apply the suffix "-phobia" inappropriately to mild or irrational fears with no serious substance; however, earlier senses relate to psychiatry which studies serious phobias which disable a person's life. For more information on the psychiatric side of this, including how psychiatry groups phobias as "agoraphobia", "social phobia", or "simple phobia", see phobia. Treatment for phobias may include desensitization (graduated exposure therapy) or flooding.
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Phonephobic's Journal - February 5th 2003 - Details one person's research on telephonophobia.