shield

A broad piece of armor made of rigid material and strapped to the arm or carried in the hand for protection against hurled or thrusted weapons.

A person or thing that provides protection.

A protective device or structure, as.

A steel sheet attached to an artillery piece to protect gunners from small-arms fire and shrapnel.

A wall or housing of concrete or lead built around a nuclear reactor to prevent the escape of radiation.

A structure or arrangement of metal plates or mesh designed to protect a piece of electronic equipment from electrostatic or magnetic interference.

A pad worn, as at the armpits, to protect a garment from perspiration.

A sanitary napkin.

A protective plate or similar hard outer covering; a scute or scutellum.

Something that resembles a shield, as.