Definition of "powerhead" [powerhead]

• The part of a machine that is the source of power (noun)
• A small pump used in aquariums (noun)
• A bangstick; a kind of underwater firearm (noun)

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• "Water circulation, oxygenation and filtration are all delivered by the powerhead provided."
• "But boy was he scared of the powerhead on the vacuum cleaner."
• "I had been using an external hang-on-back style filter – I switched to a piece of foam the same size as the side of the aquarium with a small powerhead behind it."