Moonlet
Full definition of moonlet
Noun
moonlet
(plural moonlets)- (astronomy) a very small body orbiting a planet, often as part of a ring.
- 1981, Nature http://books.google.com/books?id=5KEoAAAAMAAJ&q=define:moonlet&dq=define:moonlet&pgis=1:"A moonlet within the ring system will exert a systematic torque on ring material."