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ratsbane (n.)

"rat poison, arsenic," 1520s; see rat (n.) + bane. Compare henbane, fleabane, wolfsbane.

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Definitions of ratsbane from WordNet

ratsbane (n.)
a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer;
Synonyms: arsenic / arsenic trioxide / arsenous anhydride / arsenous oxide / white arsenic
From wordnet.princeton.edu