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lumbago (n.)

1690s, from Late Latin lumbago "weakness of loins and lower back," from Latin lumbus "hip, loin" (usually plural), from Proto-Italic *londwo- "loins," from PIE *lendh- (1) "loin" (see lumbo-).

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Definitions of lumbago

lumbago (n.)
backache affecting the lumbar region or lower back; can be caused by muscle strain or arthritis or vascular insufficiency or a ruptured intervertebral disc;
Synonyms: lumbar pain
From wordnet.princeton.edu