hub /hub/

1. The centre of a wheel, the nave
2. A mark at which quoits, etc are thrown
3. An important centre or focus of activity, as applied (archaic and facetious) to Boston, USA, esp in the phrases hub of the universe or hub of the solar system
4. The focal point (of a discussion, problem, etc)
5. A unit that connects network components together (computing)

hubˈ-brake noun

A brake acting on the hub of a wheel

hubˈ-cap noun

A metal covering over the hub of a wheel

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