Etymology
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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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lumbaginous (adj.)
"afflicted with lumbago," 1610s, from Latin combining form of lumbago + -ous.
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