from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small natural or artificial satellite.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a very small body orbiting a planet, often as part of a ring.
from The Century Dictionary and Cyclopedia
- n. A little moon: applied to the small bodies of which the rings of Saturn are composed.
From moon + the diminutive suffix -let. (Wiktionary)