al·​ti·​ther·​mal | \ ¦altə̇¦thərməl\

Definition of altithermal

: of or belonging to a time during which the climate is relatively warm often used of a part of postglacial time

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First Known Use of altithermal

1948, in the meaning defined above

History and Etymology for altithermal

alti- + thermal

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The first known use of altithermal was in 1948

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