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The Collaborative International Dictionary
Lumbaginous

Lumbaginous \Lum*bag"i*nous\, a. Of or pertaining to lumbago.

Douglas Harper's Etymology Dictionary
lumbaginous

1620s, from Latin lumbagin-, from lumbago (see lumbago) + -ous.

Wiktionary
lumbaginous

a. Of or pertaining to lumbago.