guano
Concise Oxford English Dictionary © 2008 Oxford University Press:
guano /ˈgwɑːnəʊ/
▶noun (pl. guanos) the excrement of seabirds, used as fertilizer.
■ an artificial fertilizer resembling this, especially one made from fish.
– origin C17: from Sp., or from Latin Amer. Sp. huano, from Quechua huanu ‘dung’.
'guano' also found in these Oxford entries:

