breathing mark (Q2669778)

diacritical mark in Ancient Greek that appears above or before initial vowels and diphthongs to indicate either the presence (rough breathing) or absence (smooth breathing) of an 'h' sound at the beginning of the word

Language	Label	Description	Also known as
English	breathing mark	diacritical mark in Ancient Greek that appears above or before initial vowels and diphthongs to indicate either the presence (rough breathing) or absence (smooth breathing) of an 'h' sound at the beginning of the word