Foxglove Poison Kills in an Appointment With Death
Puzzle 19 of Agatha Christie Medium Pack
Question is: Foxglove Poison Kills in an Appointment With Death
and the answer is: DIGITALIS
Word Meaning:
DIGITALIS — Any plant of the genus Digitalis (herbaceous plants of the Plantaginaceae family, including the foxglove, Digitalis purpurea).
Definitions from Wiktionary.