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PHREN'ITIS, noun [Gr. from the mind; Latin animus, animosus, and the Teutonic mod; Eng. mood.]

1. In medicine, an inflammation of the brain, or of the meninges of the brain, attended with acute fever and delirium.

2. Madness, or partial madness; delirium; phrenzy. [It is generally written in English, phrensy or frenzy.