DictionaryguanoDroppings used as fertilizer
noun

guano

GWAH-noh/ˈɡwɑːnəʊ/

Accumulated seabird or bat droppings used as fertilizer.

The gardener uses accumulated guano to fertilize the seedlings.

A compact paired scene shows the material and its use: seabirds perched above a thick accumulation of droppings on coastal rock, and a gardener scattering the same pale, crumbly material onto soil around vegetable seedlings.
Etymology

Quechua huanu means “dung.” The English sense specializes that broad meaning to accumulated seabird or bat droppings used as fertilizer.

In context

HISTORY0:05
… two miners are searching for bat guano, a key ingredient in making fertilizer.
The UnXplained: GIANT SKELETONS Found In Wild West Cave (Season 4) | History

More examples

  • The old trade relied on guano as fertilizer.
  • Bat guano covers the floor near the cave entrance.
  • Workers once collected guano from these islands.

Forms

guano