from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a spiral-shaped nebula
- n. a spiral-shaped white nebula; these were generally determined to be spiral galaxies in the 20th century
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center
spiral + nebula (Wiktionary)