noun
A building or other structure containing a (large) wheel, such as the water wheel of a mill.
(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.