noun
- One of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). planetesimal. Retrieved September 21, 2026, from http://smartdefine.org/planetesimal/definitions/1227310 |
| Chicago | WordNet. 2010. "planetesimal" http://smartdefine.org/planetesimal/definitions/1227310 (accessed September 21, 2026). |
| Harvard | WordNet 2010, planetesimal, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/planetesimal/definitions/1227310>. |
| MLA | WordNet. "planetesimal" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/planetesimal/definitions/1227310> |