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guanine

[gwah-neen]
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noun Biochemistry.
  1. a purine base, C5H5N5O, that is a fundamental constituent of DNA and RNA, in which it forms base pairs with cytosine. Symbol: G
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Compare guanosine.

Origin of guanine

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for guanine

guanine

noun
  1. a white almost insoluble compound: one of the purine bases in nucleic acids. Formula: C 5 H 5 N 5 O
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Word Origin

C19: from guano + -ine ²
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

Word Origin and History for guanine

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

guanine in Medicine

guanine

(gwänēn′)
n.
  1. A purine base that is an essential constituent of both RNA and DNA.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

guanine in Science

guanine

[gwänēn′]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.