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Molecule (Noun)

(nontechnical usage) a tiny piece of anything.

Nouns denoting substances.

She accidentally broke off a tiny molecule of her nail when opening the stubborn package.
A single molecule of doubt in her mind made him wonder if he could win her heart.
Just one molecule of food can satisfy the rumbling belly of a hummingbird for a moment.
Their wedding plans started falling apart after they encountered one troublesome molecule of family disagreement.
This complicated molecule of laws needs clarification for regular people to truly comprehend them.

(physics and chemistry) the simplest structural unit of an element or compound.

Nouns denoting substances.

The molecule of oxygen consists of two atoms bonded together by a covalent bond.
Water is a compound made up of two hydrogen atoms and one oxygen atom in a single molecule.
The molecule of carbon dioxide is composed of one carbon atom bonded to two oxygen atoms.
In a chemical reaction, molecules of the reactants collide and interact to form new molecules of the products.
The shape and structure of a molecule can greatly affect its physical and chemical properties.