black mass
n. A travesty of the Roman Catholic Mass, said to be performed by Satanists.
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.
black mass
n (Alternative Belief Systems) (sometimes capitals) a blasphemous travesty of the Christian Mass, performed by practitioners of black magic
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Black′ Mass′
n. a travesty of the Christian Mass, esp. one by alleged worshipers of Satan.
[1890–95]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
black mass
A black magic ceremony in which a perversion of the Roman Catholic Mass is used.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited