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ratsbane

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rats⋅bane

[rats-beyn]
–noun
1. rat poison.
2. the trioxide of arsenic.

Origin:
1515–25; rat + 's 1 + bane
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rats·bane   (rāts'bān')   
n.  Rat poison, especially arsenic trioxide.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

ratsbane 
"rat poison," 1523, from rat + bane (q.v.).
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: rats·bane
Pronunciation: 'rats-"bAn
Function: noun
: ARSENICTRIOXIDE
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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