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guacharo a nocturnal tropical South American bird from whose young is derived an oil used for cooking and lighting.
guaco any of several tropical South American plants that yield a medicinal substance used to treat snakebite.
guaiacum any of a family of tropical trees bearing blue or purple flowers and encapsulated fruit. [3 definitions]
Guam the largest of the Mariana Islands in the western Pacific, and a U.S. territory.
guan any of several large fowls of Central and South America that live in jungles and feed on fruit.
guanaco a reddish brown woolly ruminant animal that is related to the llama and alpaca.
Guangzhou a seaport and provincial capital on the southern coast of China; Canton.
guanidine a strongly basic water-soluble crystalline compound used in the manufacture of plastics, resins, and other industrial products.
guanine in biochemistry, a purine constituent of nucleic acids.
guano the nitrogen-rich excrement of sea birds or bats, used as fertilizer. [2 definitions]
guarani the chief monetary unit of Paraguay, equaling one hundred centimos.
guarantee an assurance, esp. in writing, that something is of salable quality and will perform satisfactorily or be repaired or exchanged at the seller's or manufacturer's expense. [10 definitions]
guarantor one that gives a pledge of quality, warranty, or the like. [2 definitions]
guaranty an agreement, assurance, or pledge regarded as security for an obligation; surety. [5 definitions]
guard to protect from danger or harm. [7 definitions]
guardant of an animal on a heraldic shield, depicted with the head facing the viewer and the body in profile.
guarded wary; cautious. [2 definitions]
guardhouse a structure used by guard personnel as a headquarters or temporary detention area.
guardian a person who guards or protects. [3 definitions]
guardrail a protective railing, as on a young child's bed or the edge of a cliff.
guardroom a room used by guards when they are on duty but not in the field. [2 definitions]