guano
noun
gua·no
ˈgwä-(ˌ)nō 
: 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
Over centuries, bacteria broke down ammonia in guano, converting it into nitrates that accumulated in cave soil.
—
Scott Travers, Forbes, 20 Mar. 2025
The bats live above the gym bleachers in a small utility closet, where the floor is covered in guano.
—Emily Schwing, ProPublica, 4 Mar. 2025
Notably, using bat guano or bird droppings as fertilizer may contribute to the infection with Histoplasma capsulatum.
—Tim Ryan, Newsweek, 17 Dec. 2024
Two men have reportedly died after inhaling bat guano used to grow marijuana, raising concerns about the safety of natural bat guano and commercially available fertilizers.
—Dario Sabaghi, Forbes, 17 Dec. 2024
See All Example Sentences for guano
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.
Scott Travers, Forbes, 20 Mar. 2025
The bats live above the gym bleachers in a small utility closet, where the floor is covered in guano.
—Emily Schwing, ProPublica, 4 Mar. 2025
Notably, using bat guano or bird droppings as fertilizer may contribute to the infection with Histoplasma capsulatum.
—Tim Ryan, Newsweek, 17 Dec. 2024
Two men have reportedly died after inhaling bat guano used to grow marijuana, raising concerns about the safety of natural bat guano and commercially available fertilizers.
—Dario Sabaghi, Forbes, 17 Dec. 2024
See All Example Sentences for guano
Cite this Entry
“Guano.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/guano. Accessed 16 Apr. 2025.
Copy CitationKids Definition
guano
noun
gua·no
ˈgwän-ō
: a substance composed chiefly of the excrement of seabirds or bats and used as a fertilizer
Love words? Need even more definitions?
Merriam-Webster unabridged
Share