B1nounscience
US/ˈmɑː.lɪ.kjuːl/
UK/ˈmɒl.ɪ.kjuːl/
the smallest unit of a substance, made of two or more atoms joined together
In context
A water molecule is made of two hydrogen atoms and one oxygen atom.
When water boils, its molecules move faster and turn into steam.
Scientists are designing new molecules to treat cancer.
Words that go with molecule
noun + noun
- water moleculeEach water molecule has a slight electric charge.
adjective + noun
- single moleculeThe new microscope can see a single molecule.
- large moleculeDNA is a very large molecule.
- complex moleculeProteins are complex molecules found in every cell.
noun + preposition
- molecule ofA molecule of oxygen contains two atoms.