Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy, physics Alternative form of
massive compact halo object .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
A back-formation from MACHO, which is used as an acronym for massive compact halo object. Words used to fill in the apparently missing "A" word include astrophysical and astronomical.
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