guano

The word 'guano' entered English in the early 17th century from Spanish, which itself borrowed it from Quechua (huanu), meaning "dung." It is a direct loanword that retains its original form and core meaning. The term became globally significant during the 19th century's agricultural boom, when the fertilizer trade from Peruvian bird-rich islands was a major commercial enterprise. Its journey from an indigenous Andean language to a specialized term in modern agronomy exemplifies how specific natural resources can carry their native names into international vocabulary.

The word is a simplex loanword from Spanish. It cannot be meaningfully segmented into productive morphemes within the English spelling system.