Definition of guanine in English:

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Pronunciation: /ˈɡwänēn/
Pronunciation: /ˈɡwänən/


A compound that occurs in guano and fish scales, and is one of the four constituent bases of nucleic acids. A purine derivative, it is paired with cytosine in double-stranded DNA.
  • Alternative name: 6-oxy-2-aminopurine; chemical formula: C5H5N5O.
Example sentences
  • There are four DNA bases: adenine, cytosine, guanine, and thymine (A, C, G, and T).
  • The film's name comes from the initials of the four DNA bases of our genetic code: guanine, adenine, cytosine and thymine.
  • The four become cytosine, guanine, adenine, and thymine, and the quantum forces that maintained the rest of universe sit on the sidelines while life take center stage.


Mid 19th century: from guano + -ine4.

For editors and proofreaders

Syllabification: gua·nine

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