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Related to smooth breathing: rough breathing
1. The symbol ( ′ ) written over some initial vowels and diphthongs in ancient Greek to indicate that a word does not begin with the sound (h).
2. In ancient Greek, an initial vowel or diphthong not preceded by the sound (h).
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.
(Phonetics & Phonology) (in Greek) the sign (᾿) placed over an initial vowel, indicating that (in ancient Greek) it was not pronounced with an h. Compare rough breathing
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a symbol (') used in the writing of Greek to indicate that the initial vowel over which it is placed is unaspirated.
2. the lack of aspiration indicated by this symbol.Compare rough breathing.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.