[sahy-tuh-seen, -zeen, -sin]
noun Biochemistry.
a pyrimidine base, C 4 H 5 N 3 O, that is one of the fundamental components of DNA and RNA, in which it forms a base pair with guanine. Symbol: C

< German Cytosin (1894); see cyto-, -ose2, -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cytosine (ˈsaɪtəsɪn)
DNA See also RNA a white crystalline pyrimidine occurring in nucleic acids; 6-amino-2-hydroxy pyrimidine. Formula: C4H5N3O

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1894, from Ger. cytosin (1894), from cyto- + -ose + -ine.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cytosine cy·to·sine (sī'tə-sēn')
Abbr. C
A pyrimidine base that is an essential constituent of RNA and DNA.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cytosine   (sī'tə-sēn')  Pronunciation Key 
A pyrimidine base that is a component of DNA and RNA, forming a base pair with guanine. Chemical formula: C4H5N3O.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It originally incorrectly identified cytosine as a nucleotide.
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