Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


Rat poison, especially arsenic trioxide.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Elements & Compounds) rat poison, esp arsenic oxide
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



1. rat poison.
2. the trioxide of arsenic.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ratsbane - a white powdered poisonous trioxide of arsenicratsbane - a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
trioxide - an oxide containing three atoms of oxygen in the molecule
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Catching a glimpse of her countenance when she becomes aware that Priscilla is a dangerous rival for Hollingworth's regard, Coverdale notes that it "would have made the fortune of a tragic actress, could she have borrowed it for the moment when she fumbles in her bosom for the concealed dagger, or the exceedingly sharp bodkin, or mingles the ratsbane in her lover's bowl of wine or her rival's cup of tea." The circumstances, however, relegate those scenes, and the chance that Zenobia might act them out, to the plane of fantasies.
Ramming pebbles into his mouth, placing nettles on his tongue, dropping some ratsbane on it, and thrusting all fingers down his throat are expressive of his desire to contend with tyrants and resist oppressors and also of his keen awareness that the path of revolutionary struggle for which he opts is perilous and might lead to loss of his own life.