zōpissa, ae, f., = ζώπισσα,
pitch mixed with wax , which was scraped off from ships , Plin. 16, 12, 23, § 56; 24, 7, 26, § 41.
Tar or pitch scraped off the bottoms of old ships, and thought to be astringent and good for ulcers....
The Sailor's Word-Book