(1838–1914), Scottish-born American naturalist, a pioneer of environmental conservation. Muir was largely responsible for the establishment of Yosemite and Sequoia National Parks in California (1890).
Definition of Muir, John in US English:
Muir, John
proper nounmyo͝or
(1838–1914), US naturalist, born in Scotland. An early advocate of wilderness preservation, he founded the Sierra Club in 1892.