Molecular (adjective)

1. Relating to or consisting of molecules.
2. Relating to the structure, properties, and reactions of molecules.

Origin:

Late latin molecularis, from latin molecula small mass, from molere to grind.

Examples:

1. Molecular biology is the study of the structure, function, and interactions of biological molecules.
2. The molecular weight of a substance is the sum of the atomic weights of its atoms.
3. The molecular structure of water is H2O.
4. Molecular chemistry studies the properties and reactions of molecules.
5. The molecular makeup of a substance determines its physical properties.