Meningitis

wiktionary

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From Ancient Greek μῆνῐγξ(mêninx) + -itis.

etymonline

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meningitis (n.)

"inflammation of the membranes of the brain or spinal cord," 1825, coined from Modern Latin meninga, from Greek meninx (genitive meningos) "membrane," in medical Latin especially that of the brain (see member) + -itis "inflammation." Related: Meningitic.