Guano (noun)

1. The excrement of sea birds or bats, used as a fertilizer.
2. A rich fertilizer composed of the excrement of sea birds or bats.

Origin:

From quechua wanu, from wana dung, excrement.

Examples:

1. Guano is an excellent source of phosphorous and nitrogen for plants.
2. The island was covered in guano from the seabirds that nested there.
3. Guano is the excrement of sea birds or bats that is used as a fertilizer.
4. Guano is high in phosphorous and nitrogen and is an effective fertilizer for plants.
5. Guano is also used as a source of nitrates for the production of gunpowder and other products.