Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
călĭgāris, e, adj. [caliga], of or pertaining to the caliga or soldier’s boot (access. form of the foll.): clavus, Plin. 9, 18, 33, § 69; 22, 22, 46, § 94: formae, Edict. Diocl. p. 23.