gum·ma / ˈgəmə/ • n. (pl. gum·mas or gum·ma·ta / ˈgəmətə/ ) Med. a small, soft swelling that is characteristic of the late stages of syphilis and occurs in the connective tissue of the liver, brain, testes, and heart.DERIVATIVES: gum·ma·tous / ˈgəmətəs/ adj.

gumma (gum-ă) n. a small soft tumour, characteristic of the tertiary stage of syphilis, that occurs in connective tissue, the liver, brain, testes, heart, or bone.