psychrometer /saɪˈkrɒmɪtə/

• 1. 

  N a type of hygrometer consisting of two thermometers, one of which has a dry bulb and the other a bulb that is kept moist and ventilated. The difference between the readings of the thermometers gives an indication of atmospheric humidity 干湿球湿度计 (Also called wet-and-dry-bulb thermometer)