CYTOSINE Meaning of CYTOSINE in English [cy.to.sine] n [ISV cyt- + -ose + [2]-ine] (1894): a pyrimidine base that codes genetic information in the polynucleotide chain of DNA or RNA--compare adenine, guanine, thymine, uracil Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012