| guan | (noun) any of several large turkey-like game birds of the family Cracidae; native to jungles of tropical America; resembling the curassows and valued as food | - |
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| guanabana | (noun) large spiny tropical fruit with tart pulp related to custard apples | Synonyms: soursop |
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| guanabenz | (noun) antihypertensive drug (trade name Wytensin) that reduces blood pressure by its effect on the central nervous system | Synonyms: Wytensin |
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| guanaco | (noun) wild llama | Synonyms: Lama guanicoe |
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| guanine | (noun) a purine base found in DNA and RNA; pairs with cytosine | Synonyms: G |
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| guano | (noun) the excrement of sea birds; used as fertilizer | - |
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| guanosine | (noun) a nucleoside component of DNA; composed of guanine and deoxyribose | Synonyms: deoxyguanosine |
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