re·lax·ant (r?-l?k?s?nt)n.1. A drug that causes muscle relaxation.2. Something that helps one to relax: Taking a walk is a great relaxant after working all day.3. An agent used to straighten curly hair; a relaxer.re·lax?ant adj.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.relaxant (r??læks?nt) n (Medicine) med a drug or agent that relaxes, esp one that relaxes tense musclesadjof, relating to, or tending to produce relaxationCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014re?lax?ant (r??læk s?nt) adj. 1. of, pertaining to, or causing relaxation. n. 2. a drug that relaxes, esp. one that lessens strain in muscle. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.