Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† lărix, ĭcis f. (m. Vitruv., v. infra), = λάριξ, a larch, larch-tree, Plin. 16, 10, 19, § 43; Vitr. 2, 9, 14; Luc. 9, 920.