Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cummis, is, and cummi, indecl., v. gummi.
† gummi or cummi, indecl. n., com-mis and cummis, or gummis, is, f. (gen. Graec. gummeos, Mart. Cap. 3, § 225), = κόμμι, gum, Plin. 16, 26, 45, § 108; 24, 1, 1, § 3 al.; 13, 12, 26, § 66; Col. 12, 52, 16 et saep. (in Plin. cummi or cummis is the reading in the best MSS.).