molecule

/ˈmɑlɪˌkjul/
noun
  1. The smallest unit of a chemical substance that can exist independently and still have the properties of that substance, made up of two or more atoms bonded together.
    • The perfume's scent molecules travel through the air to reach your nose.
    • A water molecule is made of two hydrogen atoms and one oxygen atom.
    • Scientists use powerful microscopes to see individual molecules.
  2. A very small amount or particle of something.
    • There wasn't a molecule of truth in his story.
    • He didn't have a molecule of doubt about his decision.
    • She felt a molecule of hope when she heard the news.
Synonyms