a natural manure composed chiefly of the excrement of sea birds, found especially on islands near the Peruvian coast.
any similar substance, as an artificial fertilizer made from fish.

1595–1605; < Spanish: fertilizer, dung; American Spanish huano dung < Quechua wanu dung for fuel, fertilizer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
guano (ˈɡwɑːnəʊ)
n , pl -nos
1.  a.  the dried excrement of fish-eating sea birds, deposited in rocky coastal regions of South America: contains the urates, oxalates, and phosphates of ammonium and calcium; used as a fertilizer
 b.  the accumulated droppings of bats and seals
2.  any similar but artificial substance used as a fertilizer
[C17: from Spanish, from Quechuan huano dung]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1604, from Sp. guano "dung," especially of sea-birds on islands off Peru, from Quechua huanu "dung." Guanine, named 1850, so called because first isolated from guano.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
guano   (gwä'nō)  Pronunciation Key 
  1. A substance composed chiefly of the dung of sea birds or bats, accumulated along certain coastal areas or in caves and used as fertilizer.

  2. Any of various similar substances, such as a fertilizer prepared from ground fish parts.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Bats also come and go, leaving behind guano, and their dead.
The dining room had that stench of fruit bat guano that you often get in old
  colonial buildings with a metal roof and a ceiling.
Although there is a large literature on dung-inhabiting fungi, much less
  research has focused on bat guano in caves.
Their guano carries diseases and that alone should be a enough to convince you
Related Words
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