Designed to block, reduce, or counteract radiation or radiant heat and energy.
From anti- (against) + radiant (emitting light or heat). Radiant comes from Latin 'radiare' meaning to shine. This scientific term developed in the 20th century as radiation became understood and managed.
NASA spacesuits use antiradiant materials to protect astronauts from cosmic radiation—it's one of those words where the engineering meaning is even cooler than the simple definition!
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