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1. The Collaborative International Dictionary of English v.0.48
Conductivity \Con`duc*tiv"i*ty\
   (k[o^]n`d[u^]k*t[i^]v"[i^]*t[y^]), n.
   The quality or power of conducting, or of receiving and
   transmitting, as heat, electricity, etc.; as, the
   conductivity of a nerve.
   [1913 Webster]

   Thermal conductivity (Physics), the quantity of heat that
      passes in unit time through unit area of a plate whose
      thickness is unity, when its opposite faces differ in
      temperature by one degree.
      [1913 Webster]

2. The Collaborative International Dictionary of English v.0.48
Thermal \Ther"mal\, a. [L. thermae hot springs, fr. Gr. ?, pl.
   of ? heat, fr. ? hot, warm, ? to warm, make hot; perhaps akin
   to L. formus warm, and E. forceps.]
   1. Of or pertaining to heat; warm; hot; as, the thermal unit;
      thermal waters.
      [1913 Webster]

            The thermal condition of the earth.   --J. D.
                                                  Forbes.
      [1913 Webster]

   2. caused by or affected by heat; as, thermal springs.
      [PJC]

   3. designed to retain heat; as, thermal underwear.
      [PJC]

   Thermal conductivity, Thermal spectrum. See under
      Conductivity, and Spectrum.

   Thermal unit (Physics), a unit chosen for the comparison or
      calculation of quantities of heat. The unit most commonly
      employed is the amount of heat necessary to raise the
      temperature of one gram or one pound of water from zero to
      one degree Centigrade. See Calorie, and under Unit.
      [1913 Webster]

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