ratsbane

[ rats-beyn ]
/ ˈrætsˌbeɪn /

noun

rat poison.
the trioxide of arsenic.

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Origin of ratsbane

First recorded in 1515–25; rat + 's1 + bane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for ratsbane

ratsbane
/ (ˈrætsˌbeɪn) /

noun

rat poison, esp arsenic oxide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012