Kuiper belt object
Any of the small icy bodies orbiting the sun in the Kuiper belt, generally having a diameter less than Pluto's. Pluto is a large Kuiper belt object that was probably captured in its present solar orbit by an encounter with the planet Neptune.
Origin of Kuiper belt objectAfter Gerard Kuiper, (1905–1973), Dutch-born American astronomer who speculated about the existence of such bodies.
(plural Kuiper belt objects)