Definition of refugium
: an area of relatively unaltered climate that is inhabited by plants and animals during a period of continental climatic change (such as a glaciation) and remains as a center of relict forms from which a new dispersion and speciation may take place after climatic readjustment
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Merriam-Webster unabridged
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Time Traveler for refugium
The first known use of refugium was in 1943
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