As an adjective cardiotonic
is that has a favourable (tonic) effect on the action of the heart.
As a noun digitalin is
any of a mixture of glycosides, extracted from the foxglove plant, that is used as a cardiotonic.
digitalin
English
Noun
(
en noun)
Any of a mixture of glycosides, extracted from the foxglove plant, that is used as a cardiotonic