Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
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
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nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A speech sound produced by a momentary complete closure of the glottis, followed by an explosive release.