Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† scōrĭa, ae, f., = σκωρία, dross, slag, scoria of metals, Plin. 33, 4, 21, § 69; 33, 6, 35, § 105; 34, 11, 24, § 107; 34, 18, 51, § 171; Pall. 1, 41, 3; Vulg. Isa. 1, 22.