Lewis & Short

strigmentum, i, n. [stringo].

  1. I. In gen., that which is scratched or scraped off, a scraping (post-Aug.), Plin. 20, 3, 8, § 17.
  2. II. In partic., filth or dirt scraped off, Cels. 2, 6 med.; 5, 2, 4; Plin. 9, 51, 74, § 160; 28, 4, 13, § 51; Val. Max. 9, 14, ext. 2 al.