Boracic lint is a type of medical dressing made from surgical lint that is soaked in a hot, saturated solution of boracic acid and glycerine and then left to dry.
Medical dressing
It has been in use since at least the 19th century,1 but is now less commonly used. When in use, boracic lint proved to be very valuable in the treatment of leg ulcers.2
The term "boracic" is also used as Cockney rhyming slang for having no money: "boracic lint" → "skint".
References
Pennington, T. H. (January 1995). "Listerism, its decline and its persistence: the introduction of aseptic surgical techniques in three British teaching hospitals, 1890-99". Medical History. 39 (1): 35–60. doi:10.1017/s0025727300059470. ISSN 0025-7273. PMC 1036937. PMID 7877404. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1036937 ↩
Braithwaite, William (1876). The Retrospect of Practical Medicine and Surgery. W. A. Townsend Publishing Company. p. 85. boracic lint. https://archive.org/details/retrospectpract21braigoog ↩