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We found 4 dictionaries that define the word cassiopeia a:

General (2 matching dictionaries)
  1. Cassiopeia A: Collins English Dictionary
  2. Cassiopeia A: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. Cassiopeia A, Cassiopeia A: Encyclopedia

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Definitions from Wikipedia (Cassiopeia A)

▸ noun:  Cassiopeia A (Cas A) is a supernova remnant in the constellation Cassiopeia and the brightest extrasolar radio source in the sky at frequencies above 1 GHz.


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