blood libel n 1. (Law) medieval history the malicious accusation that Jews used the blood of non-Jews in religious rituals 2. (Law) any false accusation of violence, murder, or blood lust Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014