An object orbiting the sun in the Kuiper belt; (also) one believed to have originated in the belt, even though its present orbit is outside it; abbreviated KBO.
Origin
1990s; earliest use found in Newsday.
Definition of Kuiper belt object in US English:
Kuiper belt object
noun
Astronomy
An object orbiting the sun in the Kuiper belt; (also) one believed to have originated in the belt, even though its present orbit is outside it; abbreviated KBO.