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Jan Hendrick. 1900–92, Dutch astronomer, who confirmed (1927) and developed the theory of galactic rotation. He was the first to propose (1950) the existence of a mass of comets orbiting the sun far beyond the orbit of Pluto (the Oort cloud)


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  • Oort-cloud

    [awrt, ohrt] /ɔrt, oʊrt/ noun, Astronomy. 1. a region of the solar system far beyond the orbit of the dwarf planet in which billions of comets move in nearly circular orbits unless one is pulled into a highly eccentric elliptical orbit by a passing star. Compare . n. in reference to the hypothetical cloud of […]

  • Oory

    [oo r-ee] /ˈʊər i/ adjective, Scot. 1. . [oo r-ee] /ˈʊər i/ adjective, Scot. 1. shabby; dingy. 2. melancholy; languid.

  • Oos

    [oh-oh] /ˈoʊ oʊ/ noun, plural o-os. 1. any of several species of Hawaiian honey eaters of the genus Moho, especially the extinct M. nobilis, of the island of Hawaii, that had black plumage and two tufts of yellow plumes used to make ceremonial robes for the Hawaiian kings. out of service

  • Oosd

    Object-oriented structured design: a design method elaborated from structured design and incorporating the essential features of the object-oriented approach.

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