Synonyms for keystone

On this is the inscription: “Her loss was that as of a keystone to an arch.”

The keystone of the arch had been removed, the downfall of the whole must follow.

In fact, not a few of us think that the Strathcona is the keystone of the Mission.

That is the keystone of American liberty—'malice toward none.'

From the pavement to the keystone of its vault is but 132 French feet—about 150 English.

But neatness was the keystone of good, efficient work in any field.

The tenet of predestination was the keystone of his religion.

"Dead" secrecy was the keystone of all plans and confidences.

The 'sovereign,' in fact, is the keystone of the whole Utilitarian system.

Thrift is the keystone that supports the arch of the savings bank.