Lewis Short
gummi | cummi, is | com-mis | cummis | gummis (noun N.f) : or , n., and , or , , 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.).
Charlton T. Lewis, Charles Short, A Latin Dictionary