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pow·er·head / ˈpou(-ə)rˌhed/ • n. 1. inf. a powerful egomaniac: record-industry powerheads.2. any of various mechanical or electrical devices, including: ∎  a submersible pump for an aquarium that creates current within a tank. ∎  a vacuum-cleaner attachment that houses an independent motor that drives a carpet-beating rotating brush. ∎  the internal combustion engine of an outboard motor. ∎  the power unit of an automatic garage door opener.