Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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external degree a college or university diploma awarded to a nonmatriculated student who has earned credit through work experience, nonacademic training, independent study, or the passing of proficiency examinations.
external respiration the exchange of carbon dioxide and oxygen across external or respiratory surfaces, such as gills, in multicellular organisms.
external-combustion engine an engine in which the combustion of fuel occurs outside the cylinder or turbine, as in a steam engine.