Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ōchra, ae, f., = ὤχρα, ochre, yellow ochre, a kind of earth that yields a yellow color, Plin. 35, 6, 12, § 30; Cels. 5, 18, 19; Vitr. 7, 7.