from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A disk of interstellar material gathered into orbit by the gravitational field of a celestial object, such as a star or black hole, and gradually spiraling into the object.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A structure formed by matter falling into a gravitational source such as a
galaxy, black hole, or protostar.
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