smooth breathing
nounEtymology Calque of Latin spīritus lēnis, from Ancient Greek ψιλὸν πνεῦμα (psilòn pneûma).
1
Human sciences, Linguistics, Phonetics, Phonology, Sciences The lack of aspiration on a vowel or semivowel in Ancient Greek.
2
Communications, Journalism, Literature, Media, Orthography, Publishing, Writing A diacritic (’/◌̓) in Ancient, Medieval and Modern Greek used to indicate this lack of aspiration (or its historical presence), e.g. ἀ, ῤ.