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keystone

DEFINITIONS OF: keystone

1

n the central building block at the top of an arch or vault

Synonyms:
headstone, key
Types:
coign, coigne, quoin
the keystone of an arch
Type of:
building block
a block of material used in construction work

n a central cohesive source of support and stability

“the keystone of campaign reform was the ban on soft money”
Synonyms:
anchor, backbone, linchpin, lynchpin, mainstay
Type of:
support
something providing immaterial assistance to a person or cause or interest
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