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ratsbane

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WordReference Random House Unabridged Dictionary of American English © 2026

rats•bane n.

Pest Controlrat poison.
the trioxide of arsenic.

rat + 's¹ + bane 1515–25

Collins Concise English Dictionary © HarperCollins Publishers::

ratsbane /ˈrætsˌbeɪn/ n

rat poison, esp arsenic oxide

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