|1.||[ noun ] a central cohesive source of support and stability|
|Synonyms:||anchor backbone linchpin lynchpin mainstay|
"faith is his anchor" "the keystone of campaign reform was the ban on soft money" "he is the linchpin of this firm"
|Related terms:||support anchor|
|2.||[ noun ] (architecture) the central building block at the top of an arch or vault|
|Related terms:||building_block quoin arch|