A flowering plant (foxglove) or a powerful heart medicine derived from it.
From New Latin 'digitalis' combining Latin 'digitus' (finger) because the flowers resemble thimbles or fingers. Named by botanists in the 1500s-1600s.
Digitalis saved millions of lives by treating heart failure, yet it's extremely poisonous—the difference between medicine and poison is literally just the dose, a principle called Paracelsus's Law.
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