Etymology
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guanine (n.)

1846, from guano, from which the chemical first was isolated, + chemical suffix -ine (2).

updated on April 24, 2015

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Definitions of guanine from WordNet

guanine (n.)
a purine base found in DNA and RNA; pairs with cytosine;
Synonyms: g
From wordnet.princeton.edu, not affiliated with etymonline.