·noun A substance found in great abundance on some coasts or islands frequented by sea fowls, and composed chiefly of their excrement. It is rich in phosphates and ammonia, and is used as a powerful fertilizer.
guana See goanna ...
Dictionary of Australasian Words Phrases and Usages by Edward E. Morris
The excrement of sea-birds, a valuable manure found in thick beds on certain islets on the coast of ...
The Sailor's Word-Book