molecular

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IN BRIEF: Relating to the smallest particle of a substance that can exist without losing its chemical form.

Scientists study substances at the molecular level to see why those substances act as they do.

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the number of molecular entities involved in a simple, one-step, chemical reaction (it is not used to describe an overall reaction with more than one step). In the two-step reaction: A + B → C → D, the molecularity of the first step is two, i.e. it is bimolecular, and the molecularity of the second step is one, i.e. it is unimolecular.

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Of, pertaining to, or composed of molecules.

• m. activity — see enzyme activity.
• m. biology — study of the biochemical and biophysical aspects of the structure and function of genes and other subcellular entities, and of such specific proteins as hemoglobins, enzymes and hormones; it provides knowledge of cellular differentiation and metabolism and of comparative evolution.
• m. layer — layers of cells in both cerebellar and cerebral cortices.
• m. mimicry — see antigenic mimicry.
• m. weight — see molecular weight.

See words rhyming with "molecular."