An instrument for indicating the temperature of any substance; often a sealed vacuum tube containing mercury, which expands with heat and contracts with cold, its level accordingly rising or falling in the tube, with the exact degree of variation of level being indicated by a scale, or, more recently, a device with an electronic sensor that displays the temperature without the use of mercury.
[thermo- + G. metron, measure]
See Also: scale
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Examples: glitazone, GI cocktail, etc.