molecule

Pronunciation

• (UK) IPA ^(key): /ˈmɒləkjuːl/
• (US) IPA ^(key): /ˈmɑləkjul/

• Audio (UK)

  (file)

• Hyphenation: mol‧e‧cule

Noun

Singular molecule

Plural molecules

Structural formula and two molecule models of caffeine.

1. (countable) (physics) A molecule is the smallest part of a substance.
   • Synonym: fragment

   A water molecule is made of two hydrogen atoms and one oxygen atom.

Related words

• molecular

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