Kuiper-belt-object definitions

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.
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(astronomy) A type of trans-Neptunian object (TNO) (a certain type of minor planet) that has an orbit in the Kuiper belt (between 30-50 AU) with inclinations consistent with the ecliptic.
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Origin of kuiper-belt-object

After Gerard Kuiper (1905–1973), Dutch-born American astronomer who speculated about the existence of such bodies