noun

• A building or other structure containing a (large) wheel, such as the water wheel of a mill.
• The partially enclosed structure above and around a wheel of an automobile, typically partly formed by a portion of a fender panel that has been extended outward beyond the plane of the rest of the panel.
• An enclosed compartment on the deck of a vessel such as a fishing boat, originally housing its helm or steering wheel, from which it may be navigated; on a larger vessel it is the bridge.
• The enclosed structure around the paddlewheel of a steamboat.
• (archaeology) A prehistoric structure from the Iron Age found in Scotland, characteristically including an outer wall within which a circle of stone piers (resembling the spokes of a wheel) form the basis for lintel arches supporting corbelled roofing with a hearth at the hub.
• (Canada, US, baseball, by extension from sense 1.2) A pitch location which is favourable to the hitter.
• (Canada, US, figuratively) A person's area of authority or expertise.
• (Canada, US, figuratively) A set of skills necessitated by a situation.