Accretion Disk Definition

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.
American Heritage

(astronomy) A structure formed by matter falling into a gravitational source such as a galaxy, black hole, or protostar.

Wiktionary

Other Word Forms of Accretion Disk

Noun

Singular:
accretion disk
Plural:
accretion-disks

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accretion disk