Di·o·ny·sus (d???-n??s?s, -n??-)n. Greek & Roman Mythology The god of wine and of an orgiastic religion celebrating the power and fertility of nature. Also called Bacchus.[Latin Dion?sus, from Greek Dion?sos.]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.Dionysus (?da???na?s?s) or Dionysosn (Classical Myth & Legend) the Greek god of wine, fruitfulness, and vegetation, worshipped in orgiastic rites. He was also known as the bestower of ecstasy and god of the drama, and identified with BacchusCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Di?o?ny?sus or Di?o?ny?sos (?da? ??na? s?s) n. an ancient Greek and Roman fertility god, associated esp. with the vine and wine. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.