hub

n. center of a wheel into which the spokes are placed; central point around which other things revolve; center, focus; center of activity; (Computers) central part of a disk that is held by the drive in order to make it turn at the correct speed; (Computers) common point of connection for devices in a network

Hub may refer to: Technical meaningsThe centre of a wheel, normally incorporating a bearing.Node (networking) in a computer network Ethernet hub, a computer networking deviceUSB hub, a device that allows many USB devices to be connected to a single USB portDirect Connect hubs are central servers to which clients connectTransportation hub, where traffic is exchanged across several modes of transportAirline hub, an airport that serves as the base of operations for an airline
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Hub, n that part of a needle that connects to a syringe barrel. Usually made of plastic or metal. [more]Hub - Community and Resources

Noun
1. the central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes
(hypernym) part, portion
(part-holonym) car wheel
2. a center of activity or interest or commerce or transportation; a focal point around which events revolve; "the playground is the hub of parental supervision"; "the airport is the economic hub of the area"
(hypernym) center, centre, middle, heart, eye
(hyponym) civic center, municipal center, down town

n. stroke, piston, lifting, raising (Mechanics)