What is the meaning of Buttress?

A brick or stone structure built against another structure to support it.

Anything that serves to support something; a prop.

A buttress-root.

A feature jutting prominently out from a mountain or rock.

Anything that supports or strengthens.

To support something physically with, or as if with, a prop or buttress.

To support something or someone by supplying evidence.

Source: wiktionary.org