SWAMP-ORE, noun In mineralogy, an ore of iron found in swamps and morasses; called also bog-ore, or indurated bog iron ore. Its color is a dark yellowish brown or gray; its fracture is earthy, and it contains so much phosphoric acid as to injure its tenacity.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI