- (n.) One of the very small invisible particles of which all matter is supposed to consist.
- (n.) A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom.
- (n.) The smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). molecule. Retrieved September 20, 2026, from http://smartdefine.org/molecule/definitions/2033870 |
| Chicago | Webster's. 2011. "molecule" http://smartdefine.org/molecule/definitions/2033870 (accessed September 20, 2026). |
| Harvard | Webster's 2011, molecule, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/molecule/definitions/2033870>. |
| MLA | Webster's. "molecule" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/molecule/definitions/2033870> |