a device for measuring temperature by observing the pressure of gas at a constant volume or the volume of a gas kept at a constant pressure
gas thermometer in American English
noun
a device for measuring temperature by observing the change in either pressure or volume of an enclosed gas
Word origin
[1875–80]This word is first recorded in the period 1875–80. Other words that entered Englishat around the same time include: cross-fertilization, hat trick, massage, musical chairs, overdraft