n. [ Gr. &unr_; cold, frost + -meter. ] (Physics) A thermometer for the measurement of low temperatures, esp. such an instrument containing alcohol or some other liquid of a lower freezing point than mercury. [ Webster 1913 Suppl. ]
n. [ Pyro- + -meter: cf. F. pyromètre. ]
☞ It is usually constructed so as to register the change which the heat to be measured produces in the length of some expansible substance, as a metallic rod, or in the intensity of a thermo-electric current. [ 1913 Webster ]
n. [ Pyro- + -meter: cf. F. pyromètre. ]
☞ It is usually constructed so as to register the change which the heat to be measured produces in the length of some expansible substance, as a metallic rod, or in the intensity of a thermo-electric current. [ 1913 Webster ]