Ge′o‐ther‐mom″e‐ter (?), n. [Gr. γέα, γη̑, the earth + E. thermometer.] (Physics) A thermometer specially constructed for measuring temperetures at a depth below the surface of the ground.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.