no-hit·ter (n??h?t??r)n. Baseball A game in which one pitcher allows the opposing team no hits.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.no?-hit?ter n. a baseball game in which a pitcher allows no base hits to the opposing team. [1935?40] no?-hit`, adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.