Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
strĭa, ae, f., a furrow, channel, hollow: quā aratrum vomere striam facit, sulcus vocatur, Varr. R. R. 1, 29, 3; the flute of a column, Vitr. 3, 4, 14; 4, 1, 7 al.; 4, 1 med.; 4, 4 med.; Plin. 22, 22, 46, § 92.