lumbago

n [U] pain in the muscles of the lower part of the back, caused by rheumatism 腰痛（风湿所致的）.

Luddite, ludicrous, ludicrously, ludicrousness, ludo, luff, luffa, lug, luge, luggage, luggage-rack, luggage-van, lugger, lugubrious, lugubriously, lugubriousness, lugworm, lukewarm, lull, lullaby, lumbar, lumbar puncture, lumber, lumber-jacket, lumber-room, lumberjack, lumen, luminary, luminosity, luminous, luminously, lumme (also lummy), lump, lump sugar, lump sum, lumpish, lumpsum, lumpy, lunacy, lunar,