massive and compact halo object

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English[edit]

Etymology[edit]

A backformation from MACHO, where the "A" originally was the second letter in the word "massive", in "MAssive Compact Halo Object", to provide a separate word to fill in the "A" in the acronym, using "and"

Noun[edit]

massive and compact halo object (plural massive and compact halo objects)

  1. Alternative form of massive compact halo object