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The Collaborative International Dictionary
Nephralgy

Nephralgia \Ne*phral"gi*a\, Nephralgy \Ne*phral"gy\, n. [NL. nephralgia, fr. Gr. nefro`s a kidney + ? pain: cf. F. n['e]phralgie.] (Med.) Neuralgia of the kidneys; a disease characterized by pain in the region of the kidneys without any structural lesion of the latter.
--Quain.

Wiktionary
nephralgy

n. (archaic form of nephralgia English)