from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A disk-shaped region in the outer solar system lying beyond the orbit of Neptune and extending to a distance of about 50 astronomical units, containing thousands of small icy bodies, some of which are on highly elliptical orbits, periodically visiting the inner solar system as comets.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A region of space between 30 and 50 astronomical units from the Sun, roughly confined within a thick band around the ecliptic. This area is populated by many thousands of trans-Neptunian objects.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a disk-shaped region of minor planets outside the orbit of Neptune
After Gerard Kuiper (1905-1973), Dutch-born American astronomer.(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after the astronomer Gerard Kuiper (1905-1973); and belt. (Wiktionary)