active galactic nucleus

[ ăktĭv ]

See under galactic nucleus.

Nearby words

  1. active anaphylaxis,
  2. active centre,
  3. active chronic hepatitis,
  4. active congestion,
  5. active duty,
  6. active galaxy,
  7. active hyperemia,
  8. active immunity,
  9. active layer,
  10. active list

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.