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What does shield mean?

Looking for the meaning or definition of the word shield? Here's what it means.

Noun
  1. Anything that protects or defends; defense; shelter; protection.
    1. A broad piece of defensive armor, carried on the arm, formerly in general use in war, for the protection of the body.
    2. (figuratively) One who protects or defends.
    3. (lichenology) In lichens, a hardened cup or disk surrounded by a rim and containing the fructification, or asci.
    4. (mining) A framework used to protect workmen in making an adit under ground, and capable of being pushed along as excavation progresses.
    5. (science fiction) A field of energy that protects or defends.
  2. Something shaped like a shield, usually an inverted triangle with slightly curved lower sides.
    1. (heraldry) The escutcheon or field on which are placed the bearings in coats of arms.
    2. (Scotland, euphemistic, obsolete) A toilet seat.
    3. A spot resembling, or having the form of a shield.
    4. (obsolete) A coin, the old French crown, or écu, having on one side the figure of a shield.
    5. (transport) A sign or symbol, usually containing numbers and sometimes letters, identifying a highway route.
    6. (colloquial, law enforcement) A police badge.
  3. (geology) A large expanse of exposed stable Precambrian rock.
    1. (geology) A wide and relatively low-profiled volcano, usually composed entirely of lava flows.
  4. (figuratively, Scotland, euphemistic, obsolete) A place with a toilet seat: an outhouse; a lavatory.
Verb
  1. To protect, to defend.
  2. (electricity) to protect from the influence of
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