Heat-shield meaning

A barrier that prevents the heating of a space or an object by absorbing, reflecting, or dissipating external heat, especially a protective structure on a spacecraft or missile that dissipates heat on atmospheric reentry by melting and vaporizing.
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Any heat-protecting device or system, esp. an ablative coating or tiles, bonded to the surface of a reentry spacecraft.
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A barrier that prevents a substance from absorbing heat energy from an outside source by absorbing and dissipating, or simply reflecting, that heat. Heat shields are commonly used to protect parts of a device from heat generated by its energy source, as in isolating the cabin of a car from its motor. Many spacecraft dissipate heat generated by friction with the atmosphere upon reentry using heat shields that melt and vaporize, dissipating the energy back into the atmosphere.
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(space science) A shield designed of a substance that absorbs excessive heat from an outside source by either dissipating, reflecting or simply absorbing the heat.
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