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subatmospheric

[suhb-at-muh s-fer-ik, -feer-] /ˌsʌb æt məsˈfɛr ɪk, -ˈfɪər-/
adjective
1.
(of a quantity) having a value lower than that of the atmosphere:
subatmospheric temperatures.
Origin
1940-1945
1940-45; sub- + atmospheric
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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