Oort Cloud Definition

ôrt
noun
A spherical, moving mass of icy cosmic debris thought to exist in the vast region beyond Pluto and to be the source of the long-period comets that orbit the sun.
Webster's New World
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pronoun

(astronomy) A roughly spherical region of space from 50,000 to 100,000 astronomical units (approximately 1 light year) from the sun; supposedly the source of most comets.

Wiktionary
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Other Word Forms of Oort Cloud

Noun

Singular:
Oort cloud
Plural:
Oort clouds

Origin of Oort Cloud

  • After Jan Hendrix Oort (1900–1992), Dutch astronomer

    From American Heritage Dictionary of the English Language, 5th Edition

  • Named after Dutch astronomer Jan Hendrik Oort.

    From Wiktionary

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