Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various massive dark or very faint objects, including black holes, brown dwarf stars, or large planets, that may exist in galactic halos and make up at least part of the dark matter that is hypothesized to pervade the universe.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism massive compact halo object

Etymologies

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

[m(assive) a(strophysical) c(ompact) h(alo) o(bject).]

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