Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† psōra, ae, f., = ψώρα, the itch, mange (pure Lat. scabies), Plin. 20, 1, 2, § 4; 20, 5, 20, § 41; 22, 22, 32, § 72.