Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† thōmix (thōmex, tōmex, and tō-mix), icis, f., = θώμιξ, a cord, string, line, thread, Lucil. ap. Fest. pp. 356 and 357 Müll.; Vitr. 7, 3; Col. 12, 32; Plin. 17, 10, 11, § 62; Pall. 1, 13, 1.