lumbago

1. (uncountable) Backache of the lumbar region or lower back, which can be caused by muscle strain or a slipped disc.Examples: "Sir Oswald Feiling winced as he turned to go home. He had felt a warning twinge of lumbago."; "We may imagine an athletics coach with a scientific training researching into the physiology and the psychology of runners. [...] He finds out the effects of fatigue, of alcohol, of tobacco, of lumbago and of depression upon their performances."Synonyms: low back pain, LBPalsoattributiveuncountable

2. (countable) An episode of such backache.alsoattributivecountable