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guano

C2
Uncommon

Pronunciation

UK

  • /ɡwˈɑːnəʊ/

US

  • /ˈɡwɑˌnoʊ/

Meanings

Noun

  1. bird or bat droppings used as fertilizer

Beyond the definition

Imagine exploring a dark, humid cave and finding huge piles of white and greenish material covering the walls and floor. That's guano. It may sound strange, but it is simply the built-up droppings of seabirds and bats. For centuries, people have valued it not as something gross, but as a very strong fertilizer for crops. In the past, islands with large bird or bat populations became valuable because of these deposits. Places like the Chincha Islands in Peru were major sources during the 19th century. It has also been used in making gunpowder. So next time you see a lush garden, remember it might owe some of its life to bird and bat droppings.

Examples

  1. 1

    Natural fertilizer

    Farmers on the island once used guano as a natural fertilizer.

  2. 2

    Cave safety

    The cave floor was covered in bat guano, so everyone wore masks.

  3. 3

    Scientific research

    Scientists studied ancient guano deposits to learn how seabird populations had changed over time.

See also

Similar

Shades of meaning

Contrast

Used with (collocations)

  • bat guano
  • seabird guano
  • guano deposits
  • guano fertilizer

Explore

  • organic fertilizer
  • nitrogen cycle

Forms and spellings

2 forms open this card.

Main spelling

  • guanonoun

Forms

  • guanospluralnoun