noun
- Any element of the lanthanide series (atomic numbers 57 through 71. ).
- synonyms: rare earth, lanthanoid, lanthanide, lanthanon
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). rare-earth element. Retrieved September 20, 2026, from http://smartdefine.org/rare-earth_element/definitions/1305492 |
| Chicago | WordNet. 2010. "rare-earth element" http://smartdefine.org/rare-earth_element/definitions/1305492 (accessed September 20, 2026). |
| Harvard | WordNet 2010, rare-earth element, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/rare-earth_element/definitions/1305492>. |
| MLA | WordNet. "rare-earth element" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/rare-earth_element/definitions/1305492> |