Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
tŭtŭlus, i, m., a high head-dress, formed by plaiting the hair in a cone over the forehead, worn esp. by the Flamen and his wife, Tert. Pall. 4 fin.; cf. Varr. L. L. 7, § 44 Müll.; Fest. pp 354 and 355 ib.; and v. Böttig. Sabina, 1, p. 132.