# keystone

> architectural element: wedge-shaped stone of an arch

**Wikidata**: [Q220919](https://www.wikidata.org/wiki/Q220919)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Keystone_(architecture))  
**Source**: https://4ort.xyz/entity/keystone-q220919-2


## References

1. Integrated Authority File
2. Freebase Data Dumps. 2013
3. BabelNet
4. Quora
5. National Library of Israel
6. GF WordNet