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 ]