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hub

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Synonym: 

n. ~ 1. A cylinder on which film or tape is wound to form a spool. - 2. Computing · Hardware that serves as a central connection in a network, allowing several attached devices to access the network.

Notes: 

A hub1 may have a flange, in which case the whole is called a reel. The hub and the material it holds may be contained within a cassette, cartridge, or magazine.