noun
a disk of matter that forms around a celestial object, such as a star or black hole, due to gravitational forces
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An accretion disk is a structure formed by diffuse material in orbital motion around a massive central body.
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The accretion disk around the black hole is like a giant cosmic carousel.
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Dude, did you see that sick accretion disk around the star? It's lit!
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Her mind was like a swirling accretion disk, constantly taking in new information and ideas.