In fortification, a bastion, or a rampart; a mound of earth round a place, capable of resisting cannon shot, and formed with bastions, curtains.

A fortification; also, any means of defense; as, a navy is the bulwark of a nation.

That which secures against an enemy or external annoyance; a screen or shelter; means of protection and safety. Salvation will God appoint for walls and bulwarks. IsaIah 26:1.

To fortify with a rampart; to secure by a fortification; to protect.