accretion disk
Noun. (astronomy) A structure formed by matter falling into a gravitational source such as a galaxy, black hole, or protostar.This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.