geothermometer


From The Collaborative International Dictionary of English v.0.48:

Geothermometer \Ge`o*ther*mom"e*ter\, n. [Gr. ge`a, gh^, the
   earth + E. thermometer.] (Physics)
   A thermometer specially constructed for measuring
   temperetures at a depth below the surface of the ground.
   [1913 Webster]
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