va·por·iz·er (v??p?-r??z?r)n. A device used to produce vapor from a substance.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.vaporizer (?ve?p??ra?z?) or vaporisern1. (General Physics) a substance that vaporizes or a device that causes vaporization2. (Medicine) med a device that produces steam or atomizes medication for inhalationCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014