molecule

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Pronunciation[change]

  • (UK) IPA (key): /ˈmɒləkjuːl/
  • (US) IPA (key): /ˈmɑləkjul/
  • Hyphenation: mol‧e‧cule

Noun[change]

Singular
molecule

Plural
molecules

Structural formula and two molecule models of caffeine.
  1. (countable) (physics) A molecule is the smallest part of a substance.
    A water molecule is made of two hydrogen atoms and one oxygen atom.

Related words[change]