Etymology
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nephritis (n.)

"inflammation of the kidneys," 1570s, from Late Latin nephritis, from Greek nephritis "disease of the kidneys," from nephros "kidney" (see nephro-) + -itis "inflammation." The earlier word was nefresis (late 14c.), and nefretik (modern nephritic) "affected by a disease of the kidneys" (from Medieval Latin nephreticus) also is from late 14c.

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Definitions of nephritis

nephritis (n.)
an inflammation of the kidney;
Synonyms: Bright's disease
From wordnet.princeton.edu