gum·ma \ˈgəmə\noun (pluralgum·mas \-məz\ ; alsogum·ma·ta \-məd.ə\) Etymology: New Latin, from Late Latin, gum, from Latin gummi, cummi — more at gum : a tumor of gummy or rubbery consistency that resembles granulomatous tissue and is characteristic of the tertiary stage of syphilis • gum·ma·tous\-məd.əs\adjective