1. main belt - Noun
2. Main belt - Proper noun
main belt
(astronomy) Synonym of asteroid belt; the main asteroid belt in the Solar System located roughly between the orbits of the planets Mars and Jupiter.
Coordinate term: Kuiper belt
main belt (plural main belts)
(nautical, military) The primary belt of armor protecting the sides of a warship above and slightly below the waterline.
Main Belt
Alternative letter-case form of main belt
main-belt
The observatory will detect as many as 90 percent of near-Earth objects (NEOs), as small as 140 meters in diameter and as far away as the Main Belt of asteroids. Source: Internet