Evaporate \E*vap"o*rate\, v. t.
   1. To convert from a liquid or solid state into vapor
      (usually) by the agency of heat; to dissipate in vapor or
      fumes.
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   2. To expel moisture from (usually by means of artificial
      heat), leaving the solid portion; to subject to
      evaporation; as, to evaporate apples.
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   3. To give vent to; to dissipate. [R.]
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            My lord of Essex evaporated his thoughts in a
            sonnet.                               --Sir. H.
                                                  Wotton.
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   Evaporating surface (Steam Boilers), that part of the
      heating surface with which water is in contact.
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