Webster's English Dictionary

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barometer

ba.rom.e.ter or baro.met.ri.cal \b*-'ra:m-*t-*r\ \.bar-*-'me-trik\ 
   \-tri-k*l\ \-tri-k(*-)le-\ \b*-'ra:m-*-tre-\ n 1: an instrument for 
   determining the pressure of the atmosphere and hence f or assisting in 
   judgment as to probable weather changes and for determining the height of 
   an ascent 2: something that serves to register fluctuations (as in public 
   opinion)  - baro.met.ri.c aj