Medical Definition of digitalis
1a capitalized : a genus of Eurasian herbs of the snapdragon family (Scrophulariaceae) that have alternate leaves and racemes of showy bell-shaped flowers and comprise the foxglovesb: foxglove
2: the dried leaf of the common European foxglove (Digitalis purpurea) that contains physiologically active glycosides, that is a powerful cardiotonic acting to increase the force of myocardial contraction, to slow the conduction rate of nerve impulses through the atrioventricular node, and to promote diuresis, and that is used in standardized powdered form especially in the treatment of congestive heart failure and in the management of atrial fibrillation, atrial flutter, and paroxysmal tachycardia of the atria; broadly : any of various glycosides (as digoxin or digitoxin) that are constituents of digitalis or are derived from a related foxglove (D. lanata)
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