vom·it (v?m??t)v. vom·it·ed, vom·it·ing, vom·its v.intr.1. To eject part or all of the contents of the stomach through the mouth, usually in a series of involuntary spasmic movements.2. To be discharged forcefully and abundantly; spew or gush: The dike burst, and the floodwaters vomited forth.v.tr.1. To eject (contents of the stomach) through the mouth.2. To eject or discharge in a gush; spew out: The volcano vomited lava and ash.n.1. The act or an instance of ejecting matter from the stomach through the mouth.2. Matter ejected from the stomach through the mouth.3. An emetic.[Middle English vomiten, from Latin vomit?re, frequentative of vomere; see wem?- in Indo-European roots.]vom?it·er n.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.vomiting (?v?m?t??) n (Medicine) med the act of ejecting the contents of the stomach through the mouth as the result of involuntary muscular spasms of the stomach and oesophagusCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014