glottal stop definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Phonet. a speech sound (IPA symbol [ʾ]) articulated by a momentary complete closing of the glottis: it is sometimes heard as a variant for medial t (as in bottle or water) in some English dialects, and is the medial sound in the negative expression conventionally spelled unh-unh in English
glottal stop definition by American Heritage Dictionary
A speech sound produced by a momentary complete closure of the glottis, followed by an explosive release.