# massive astronomical compact halo object

> English word · Noun

## Definitions
1. Alternative form of massive compact halo object.

## Etymology
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 "astronomical"

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/massive-astronomical-compact-halo-object