Dictionary

accretion disk

noun

Definition of ACCRETION DISK

:  a disk of usually gaseous matter surrounding a massive celestial object (as a black hole) in which the matter gradually spirals in toward and accretes onto the object as a result of gravitational attraction

First Known Use of ACCRETION DISK

1972

Browse

Next Word in the Dictionary: accroachPrevious Word in the Dictionary: accretion cuttingAll Words Near: accretion disk
March 26, 2015
verdigris Hear it
A green deposit formed on some metals
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears