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In the polytonic orthography of Ancient Greek, the rough breathing (Ancient Greek: δασὺ πνεῦμα dasỳ pneûma or δασεῖα daseîa; Modern Greek: δασεία dasía; Latin spīritus asper), is a diacritical mark used to indicate the presence of an /h/ sound before a vowel, diphthong, or after rho. It remained in the polytonic orthography even after the Hellenistic period, when the sound disappeared from the Greek language. In the monotonic orthography of Modern Greek phonology, in use since 1982, it is not used at all.
The absence of an /h/ sound is marked by the smooth breathing.
The rough breathing comes from the left-hand half of the letter H. In some Greek dialects, the letter was used for [h] (Heta), and this usage survives in the Latin letter H. In other dialects, it was used for the vowel [ɛː] (Eta), and this usage survives in the modern system of writing Ancient Greek, and in Modern Greek.