powerhead

The term "powerhead" is usually used for the part of a machine that contains or delivers the main power. In boating, it most often means the engine section of an outboard motor, including the main internal engine parts. When someone talks about repairing or rebuilding the powerhead, they usually mean the engine itself, not the lower unit or the propeller.

The word is also common in the world of tools. A powerhead can be the motorized base of a tool system that accepts different attachments. A person might use the same unit with a trimmer, pruner, or other add-on tool, so the meaning centers on the powered base rather than the attachment.

In aquarium use, a powerhead is a small pump placed underwater to create water flow and circulation. This helps move water around the tank and is especially useful in setups that need steady current. In another, much rarer use, a powerhead can mean the firing end of a bangstick, a contact weapon sometimes carried underwater.

The term also appears in household cleaning. On a vacuum cleaner, a powerhead is the motorized floor head, often with a rotating brush for cleaning carpet. Across these uses, the idea stays mostly the same: it is the powered head or engine unit that drives the work.