from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A galaxy having a spiral structure.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A galaxy having a number of arms of younger stars that spiral out from the centre containing older ones
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
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