stut·ter (st?t??r)intr. & tr.v. stut·tered, stut·ter·ing, stut·ters To speak or utter with a spasmodic repetition or prolongation of sounds.n. The act or habit of stuttering.[Frequentative of dialectal stut, from Middle English stutten.]stut?ter·er n.stut?ter·ing·ly adv.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.