- [noun] a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"
Synonyms: anchor, mainstay, backbone, linchpin, lynchpin
- [noun] the central building block at the top of an arch or vault
Synonyms: key, headstone
- Search for synonyms for KEYSTONE