ear defender/ear protector

Any device, such as an earplug or an earmuff, used to protect the human ear from loud noises, like that of jet engines, that may damage hearing. Combined earplugs and earmuffs provide the maximum ear protection. Another combination of helmet and neoprene earplugs is equally effective. The illustration indicates the maximum attenuation level of some of the protection devices.

Aviation dictionary. 2014.

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