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[gwah-neen] /ˈgwɑ nin/
noun, Biochemistry
a purine base, C 5 H 5 N 5 O, that is a fundamental constituent of DNA and RNA, in which it forms base pairs with cytosine. Symbol: G.
Compare guanosine.
Origin of guanine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for guanine


/ˈɡwɑːniːn; ˈɡuːəˌniːn/
a white almost insoluble compound: one of the purine bases in nucleic acids. Formula: C5H5N5O
Word Origin
C19: from guano + -ine²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for guanine

1850, from guano, from which the chemical first was isolated, + chemical suffix -ine (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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guanine in Medicine

guanine gua·nine (gwä'nēn')
Abbr. G
A purine base that is an essential constituent of both 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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guanine in Science
A purine base that is a component of DNA and RNA, forming a base pair with cytosine. It also occurs in guano, fish scales, sugar beets, and other natural materials. Chemical formula: C5H5ON5.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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