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truth serum
truth se·rum (plural truth se·rums)


noun 
Definition:
 
drug inducing truth-telling: a sedative such as thiopental sodium that is supposed to make the person taking it tell the truth by either reducing inhibitions or causing hypnosis
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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