digitalis
Concise Oxford English Dictionary © 2008 Oxford University Press:
digitalis /ˌdɪdʒɪˈteɪlɪs/
▶noun a drug prepared from foxglove leaves, containing substances that stimulate the heart muscle.
– origin C18: from the mod. L. genus name of the foxglove, from digitalis (herba) ‘(plant) relating to the finger’, suggested by Ger. Fingerhut ‘thimble or foxglove’.
'digitalis' also found in these Oxford entries:

