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smooth breathing

noun
  1. a symbol (') used in the writing of Greek to indicate that the initial vowel over which it is placed is unaspirated.
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Compare rough breathing.

Origin of smooth breathing

First recorded in 1740–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for smooth breathing

smooth breathing

noun
  1. (in Greek) the sign (᾿) placed over an initial vowel, indicating that (in ancient Greek) it was not pronounced with an hCompare rough breathing
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012