Look up shield in Wiktionary, the free dictionary.
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Shield, a hand-held protective device, meant to intercept attacks
Shielding is a term used informally within some online communities to describe methods used by empathic individuals to protect themselves from emotional overwhelm and over-stimulation caused by proximity to other people.
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The oldest form of shield was a protection used to block attacks by hand weapons, such as swords, axes and maces, and missiles, like spears and arrows.
Shields for protection from armed attack are still used by many police forces around the world.
The second type of modern police shield is typically manufactured from advanced synthetics such as kevlar and are designed to be bulletproof, or at least bullet resistant.
Shield volcano: Hawaii and Iceland are examples of places where volcanoes extrude huge quantities of lava that gradually build a wide mountain with a shield-like profile.
The largest lava shield on Earth, Mauna Loa, is 9,000 m tall (it sits on the sea floor), 120 km in diameter and forms part of the Island of Hawai'i.
Olympus Mons is a shield volcano on Mars, and the tallest mountain in the known solar system.