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Definition of Muir
1. Noun. United States naturalist (born in England) who advocated the creation of national parks (1838-1914). 
Definition of Muir
1. a heath [n -S] - See also: heath
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1. Noun. United States naturalist (born in England) who advocated the creation of national parks (1838-1914). 
1. a heath [n -S] - See also: heath