A type of smoked herring or fish, or anything/anyone that bloats or causes swelling.
From 'bloat' plus '-er' (a suffix creating nouns for things that perform an action or are characterized by a quality). The term was originally applied to a specific preparation of herring fish.
A bloater is actually a regional British food delicacy—a whole herring smoked without being gutted, which makes it puff up and develop a distinctive flavor that's been eaten for centuries.
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