noun.Backache of the lumbar region or lower back, which can be caused by muscle strain or a slipped disk.
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noun.
backache affecting the lumbar region or lower back; can be caused by muscle strain or arthritis or vascular insufficiency or a ruptured intervertebral disc
Word Usage
"To-morrow we go finally and positively, though the lumbago is almost disappeared, and we were to have stayed at least a fortnight."