dig·i·tal·in \ˌdijəˈtalə̇n sometimes -tāl- or -täl- or -tȧl-\noun (-s) Etymology: New Latin digitalis + English -in 1.: a white crystalline steroid glycoside C36H56O14 obtained from seeds of the purple foxglove 2.: a mixture of the glycosides of digitalis varying in composition according to the method of preparation from the leaves or seeds