Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
calcārĭus, a, um, adj. [2. calx], of or pertaining to lime, lime-: fornax, a limekiln, Cato, R. R. 38, 1; Plin. 17, 9, 6, § 53.
Also subst.