Regarding biology or chemistry, molecule can have
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Molecule
Definition
noun, plural: molecules
A tiny or a very small piece (of something).
(biology or biochemistry) An extremely small particle or substance, especially at cellular or structural level, as a biomolecule.
(physics and chemistry) The smallest unit of an element or compound, made up of two or more atoms held together by strong chemical bond.
https://www.biologyonline.com/dictionary/mole...Supplement