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subatmospheric

[suhb-at-muh s-fer-ik, -feer-]
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adjective
  1. (of a quantity) having a value lower than that of the atmosphere: subatmospheric temperatures.
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Origin of subatmospheric

First recorded in 1940–45; sub- + atmospheric
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018