Definition of guano noun from the Oxford Advanced Learner's Dictionary

 

guano

 noun
noun
BrE BrE//ˈɡwɑːnəʊ//
 
; NAmE NAmE//ˈɡwɑːnoʊ//
 
[uncountable]
 
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the waste substance passed from the bodies of birds that live near the sea, used to make plants and crops grow well Word Origin early 17th cent.: from Spanish, or from Latin American Spanish huano, from Quechua huanu ‘dung’.
See the Oxford Advanced American Dictionary entry: guano