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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