guano

noun

gua·​no ˈgwä-(ˌ)nō How to pronounce guano (audio)
: a fertilizer containing the accumulated excrement of seabirds or bats
broadly : excrement especially of seabirds or bats

Examples of guano in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Although primarily related to bird guano and agriculture rather than bat guano and gunpowder, the Guano Islands Act highlighted just how strategically important guano had become in American history. Scott Travers, Forbes, 20 Mar. 2025 Per Live Science, the case highlights the importance of raising awareness of the danger of using bat guano as a fertilizer. Gabrielle Rockson, People.com, 17 Dec. 2024 In Antarctica, the birds’ nutrient-rich guano allows mosses and other organisms to flourish in an otherwise inhospitable place. Sarah Kuta, Smithsonian Magazine, 13 Mar. 2025 The bats live above the gym bleachers in a small utility closet, where the floor is covered in guano. Emily Schwing, NPR, 4 Mar. 2025 See All Example Sentences for guano

Word History

Etymology

Spanish, from Quechua wanu fertilizer, dung

First Known Use

1604, in the meaning defined above

Time Traveler
The first known use of guano was in 1604

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Cite this Entry

“Guano.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/guano. Accessed 1 May. 2025.

Kids Definition

guano

noun
gua·​no ˈgwän-ō How to pronounce guano (audio)
: a substance composed chiefly of the excrement of seabirds or bats and used as a fertilizer

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