angel dustn. Slang Phencyclidine.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.angel dust n (Recreational Drugs) a slang name for PCP Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014phen?cy?cli?dine (f?n?sa? kl??din, -?s?k l?-) n. an anesthetic drug, C17H25N, used as an animal tranquilizer: also widely used as an illicit hallucinogen. Also called PCP. [1955?60; phen- + cycl (ic) + -idine] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.