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ratsbane

[rats-beyn] /ˈrætsˌbeɪn/
noun
1.
rat poison.
2.
the trioxide of arsenic.
Origin
1515-1525
1515-25; rat + 's1 + bane
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ratsbane

ratsbane

/ˈrætsˌbeɪn/
noun
1.
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
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Word Origin and History for ratsbane
n.

"rat poison, arsenic," 1520s; see rat (n.) + bane.

Online Etymology Dictionary, © 2010 Douglas Harper
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