Safeguard n. : One who, or that which, defends or protects; defense; protection.

Safeguard n. : A convoy or guard to protect a traveler or property.

Safeguard n. : A pass; a passport; a safe-conduct.

Safeguard v. t. : To guard; to protect.

Example:
What kind of Safeguard keeps a nuclear weapon from going off in the event of a nearby explosion?

Taxonomy
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Defination from the web:
Dental Insurance company specializing in DHMO and PPO plans.