Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various massive dark objects, such as a brown dwarf star or large planet, in the outermost regions of a galaxy, that may explain the observed anomalous rotation of most galaxies.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • massive compact halo object

Etymologies

m(assive) a(strophysical) c(ompact) h(alo) o(bject).
(American Heritage® Dictionary of the English Language, Fourth Edition)

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