noun, plural: micromolecules
A molecule that is relatively smaller (than a macromolecule), or of low molecular weight.
Monomers are considered a micromolecule that can be linked together to form polymer (which is a macromolecule). Inorganic compounds like water and minerals are examples of micromolecules.
Word origin: micro (small) + molecule.
Related forms: micromolecular (adjective)
See also: biomolecule