Definitions

from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. A swarm of comets orbiting the sun at a distance of one to two light-years, proposed as a source of comets that pass near the sun.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun

Etymologies

After Jan Hendrix Oort (1900-1992), Dutch astronomer.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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