- The definition of a shield is a person or thing that protects, blocks, guards or defends.
- An example of a shield is the flat piece of metal carried by riot police to protect their bodies against protesters.
- An example of a shield is the front window of a car.
- An example of a shield is a soccer goalie.
Riot police standing behind their shields
shield definition by Webster's New World
- a flat, usually broad, piece of metal, wood, etc., carried in the hand or worn on the forearm to ward off blows or missiles
- any person or thing that guards, protects, or defends
- a heraldic escutcheon
- anything shaped like a shield, as a plaque, trophy, badge, or emblem
- a movable canopy protecting workers from cave-ins in mines, tunnels, etc.
- a heavy metal screen attached to an artillery piece for the protection of the gunners
- a guard or safety screen, as over the moving parts of machinery
- an insulating covering on electric wires, etc.
- any material or structure used for protection against radiation
- dress shield
- Zool. a hard surface covering or shell; protective plate, as on a turtle
Origin: Middle English schelde ; from Old English scield, akin to German schild ; from Germanic an unverified form skild- ; from Indo-European base an unverified form (s)kel- from source shelf
- to be or provide a shield for; defend; protect; guard
- to hide from view; screen
- shielder noun
shield definition by American Heritage Dictionary
- 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. A steel sheet attached to an artillery piece to protect gunners from small-arms fire and shrapnel.b. Physics A wall or housing of concrete or lead built around a nuclear reactor to prevent the escape of radiation.c. Electronics A structure or arrangement of metal plates or mesh designed to protect a piece of electronic equipment from electrostatic or magnetic interference.d. A pad worn, as at the armpits, to protect a garment from perspiration.e. A sanitary napkin.
- Zoology A protective plate or similar hard outer covering; a scute or scutellum.
- Something that resembles a shield, as:a. An escutcheon.b. A decorative emblem that often serves to identify an organization or a government.c. A police officer's badge.
- Geology The ancient, stable, interior layer of continents composed of primarily Precambrian igneous or metamorphic rocks. Also called continental shield.
- To protect or defend with or as if with a shield; guard. See Synonyms at defend.
- To cover up; conceal.
Origin: Middle English sheld, from Old English scield; see skel-1 in Indo-European roots.
- shieldˈer noun
shield - Computer Definition
A covering, sheath, or screen designed to protect a signal traveling over a conductor from electromagnetic interference (EMI) due to the unwanted coupling of extraneous signals.The shield is in the form of a conductive metal foil, screen, or braid that surrounds a conductor or group of conductors. A dielectric material insulates the conductors from each other and from the shield, which essentially is an outer conductor that intercepts extraneous signals and conducts them to ground. Therefore, the shield must be continuous and must be grounded via a ground wire, or drain wire.To ensure electrical continuity, the shield must be bonded at any splice points and the shield must be bonded to the ground wire, strap, or rod. Coaxial cable, screened twisted pair (ScTP), and shielded twisted pair (STP) are examples of shielded transmission media in telecommunications applications. See also coaxial cable, dielectric, EMI, ground wire, ScTP, and STP.
shield - Medical Definition
shield - Science Definition
- A wall or housing of an absorbing material, such as 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 large geographic area where rocks of a continent's craton (the ancient, relatively undisturbed portion of a continental plate) are visible at the surface. A shield is often surrounded by platforms covered with sediment.