| Meaning | (physics and chemistry) the simplest structural unit of an element or compound. |
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| Category | chemistry, chemical science | The science of matter |
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| physics, natural philosophy | The science of matter and energy and their interactions |
| Parts | atom | (physics and chemistry) the smallest component of an element having the chemical properties of the element |
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| chain, chemical chain | (chemistry) a series of linked atoms (generally in an organic molecule) |
| group, radical, chemical group | (chemistry) two or more atoms bound together as a single unit and forming part of a molecule |
| Narrower | coenzyme | A small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes |
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| dipole molecule | A molecule that is a permanent dipole |
| ethylenediaminetetraacetic acid, EDTA | A complex molecule used medically to chelate metal ions in cases of lead or heavy metal poisoning |
| macromolecule, supermolecule | Any very large complex molecule |
| protein molecule | Any large molecule containing chains of amino acids linked by peptide bonds |
| Broader | unit, building block | A single undivided natural thing occurring in the composition of something else |
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| Spanish | molécula |
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| Catalan | molècula |
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| Adjectives | bimolecular | relating to or affecting two molecules |
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| intermolecular | existing or acting between molecules |
| intramolecular | within the molecule |
| molecular | relating to or produced by or consisting of molecules |
