guano

noun gua·no \ˈgwä-(ˌ)nō\

: waste material from birds and bats that is used to help plants grow

Full Definition of GUANO

: a fertilizer containing the accumulated excrement of seabirds or bats; broadly : excrement especially of seabirds or bats

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Spanish, from Quechua wanu fertilizer, dung

First Known Use: 1604

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