n. [ See 1st Hob. ] 1. The central part, usually cylindrical, of a wheel; the nave. See Illust. of Axle box. [ 1913 Webster ]

2. The hilt of a weapon. Halliwell. [ 1913 Webster ]

3. A rough protuberance or projecting obstruction; as, a hub in the road. [ U.S. ] See Hubby. [ 1913 Webster ]

4. A goal or mark at which quoits, etc., are cast. [ 1913 Webster ]

5. (Diesinking) A hardened, engraved steel punch for impressing a device upon a die, used in coining, etc. [ 1913 Webster ]

6. A screw hob. See Hob, 3. [ 1913 Webster ]

7. A block for scotching a wheel. [ 1913 Webster ]

8. The central location within which activities tend to concentrate, or from which activities radiate outward; a focus of activity. [ PJC ]

9. Hence: (Aeronautics) A large airport used as a central transfer station for an airline, permitting economic air transportation between remote locations by directing travellers through the hub, often changing planes at the hub, and thus keeping the seat occupancy rate on the airplanes high. The hub together with the feeder lines from remote locations constitute the so-called
hub and spoke system of commercial air passenger transportation. A commercial airline may have more than one such hub. [ PJC ]

10. The city of Boston, Massachusetts referred to locally by the nickname The Hub. [ PJC ]

Hub plank (Highway Bridges), a horizontal guard plank along a truss at the height of a wagon-wheel hub. --
Up to the hub, as far as possible in embarrassment or difficulty, or in business, like a wheel sunk in mire; deeply involved. [ Colloq. ] [ 1913 Webster ]

n. A tobacco pipe, so arranged that the smoke passes through water, making a bubbling noise, whence its name. In India, the bulb containing the water is often a cocoanut shell. It is a simple type of hookah. [ 1913 Webster ]

n. A large astromical optical telescope placed into orbit around the earth, from which, in the absence of absorption and distortion by the earth's atmosphere, clear high-resolution images of astronomical objects can be obtained in the visible, infrared, and ultraviolet wavelengths. The telescope was launched into orbit on April 24, 1990. Since then the telescope has taken thousands of images, many of them unique, recording never before seen astronomical phenomena. Service missions were performed in 1993 and 1997, during which astronauts upgraded or replaced equipment on the telescope. Link to Hubble Telescope Information. [ PJC ]

n. [ Cf. Whoobub, Whoop, Hoop, v. i. ] A loud noise of many confused voices; a tumult; uproar. Milton. [ 1913 Webster ]

This hubbub of unmeaning words. Macaulay. [ 1913 Webster ]

a. Full of hubs or protuberances; as, a road that has been frozen while muddy is hubby. [ U.S. ] [ 1913 Webster ]

n. Husband. [ informal ] [ PJC ]

n. [ After Hübner, who analyzed it. ] (Min.) A mineral of brownish black color, occurring in columnar or foliated masses. It is native manganese tungstate.