Dictionary

planetary nebula

planetary nebula

noun

Definition of PLANETARY NEBULA

:  a usually compact luminous ring-shaped nebula that is composed of matter which has been ejected from a hot star at its center

First Known Use of PLANETARY NEBULA

1785

Browse

Next Word in the Dictionary: planetary sciencePrevious Word in the Dictionary: planetary houseAll Words Near: planetary nebula
March 03, 2015
thanatology Hear it
The study of death and grieving
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