# smooth breathing

> diacritical marks used in polytonic Greek, Coptic, and old Cyrillic orthographies

**Wikidata**: [Q514198](https://www.wikidata.org/wiki/Q514198)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Smooth_breathing)  
**Source**: https://4ort.xyz/entity/smooth-breathing


## References

1. Freebase Data Dumps. 2013
2. BabelNet