Definition of cytosine in English:


Syllabification: cy·to·sine
Pronunciation: /ˈsītəˌsēn


  • A compound found in living tissue as a constituent base of nucleic acids. It is paired with guanine in double-stranded DNA.
    • A pyrimidine derivative; chemical formula: C4H5N3O
    More example sentences
    • The nitrogen-containing units are the bases: adenine, cytosine, guanine, and uracil.
    • In DNA the bases pair to form a ladder-like structure, with adenine paired with thymine and guanine with cytosine.
    • The derivatives of purine are called adenine and guanine, and the derivatives of pyrimidine are called thymine, cytosine and uracil.

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Pronunciation: skōSH
a small amount; a little