Etymology
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guano (n.)

c. 1600, from Spanish guano "dung, fertilizing excrement," especially of sea-birds on islands off Peru, from Quechua (Inca) huanu "dung."

updated on January 06, 2018

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Definitions of guano from WordNet

guano (n.)
the excrement of sea birds; used as fertilizer;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.