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trigeminal neuralgia

a disorder of unknown cause, characterized by severely painful paroxysms along one or more branches of a trigeminal nerve

See trigeminal neuralgia in American Heritage Dictionary 4

noun
Paroxysmal shooting pains of the facial area around one or more branches of the trigeminal nerve, of unknown cause, but often precipitated by irritation of the affected area. Also called tic douloureux.

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