Webster's English Dictionary

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thermometer

ther.mom.e.ter \th*(r)-'ma:m-*t-*r\ \.th*r-m*-'me-trik\ \-tri-k(*-)le-\ n 
   [F thermome'tre, fr. Gk therme- heat + F -o- + -me'tr]e -meter - more at 
   THERM : an instrument for determining temperature consisting typically of a 
   glas s bulb attached to a fine tube of glass with a numbered scale and 
   containing a liquid (as mercury or colored alcohol) that is sealed in and 
   rises and falls with changes of temperature - ther.mo.met.ric aj