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Definition of Porton Down from the Oxford Advanced Learner's Dictionary

Porton Down

 
/ˌpɔːtn ˈdaʊn/
 
/ˌpɔːrtn ˈdaʊn/
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  1. the usual name for the Defence Science and Technology Laboratory at Porton, near Salisbury in southern England. It is a British government centre for studying chemical and biological weapons.
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