- (a.) Having five hydrogen atoms capable of substitution.
- (a.) Having five atoms in the molecule.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). pentatomic. Retrieved September 21, 2026, from http://smartdefine.org/pentatomic/definitions/2043494 |
| Chicago | Webster's. 2011. "pentatomic" http://smartdefine.org/pentatomic/definitions/2043494 (accessed September 21, 2026). |
| Harvard | Webster's 2011, pentatomic, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/pentatomic/definitions/2043494>. |
| MLA | Webster's. "pentatomic" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/pentatomic/definitions/2043494> |