Definition: A device for measuring the humidity of the atmosphere by the difference in temperature between two thermometers, the bulb of one kept moist, the other dry. Evaporation from the moist bulb lowers the reading of that thermometer; the greater the difference in readings, the drier the air is; no difference indicates 100% relative humidity.
Synonym(s): wet and dry bulb thermometer
[psychro- + G. metron, measure]
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