A device that produces sound or a signal; a herd of wild boars or pigs.
From 'sound' (from Latin 'sonus') + '-er' (noun agent suffix); the animal meaning is from Middle English, referring to the collective noun for wild pigs.
A group of wild pigs is called a 'sounder' because of the loud noise they make when they move together—the animal collective noun and the device name both relate to sound!
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