Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pistrīna, ae, f. [pistor], a bakehouse, bakery, Plin. 18, 9, 20, § 86; 19, 8, 52, § 167; Varr. L. L. 5, 31, 138; Lucil. ap. Charis. p. 55 P.