bolometer

bo·lom·e·ter

noun \bō-ˈläm-ət-ər\

Definition of BOLOMETER

: a very sensitive thermometer used in the detection and measurement of feeble thermal radiation and especially adapted to the study of infrared spectra

—bo·lo·met·ric \ˌbō-lə-ˈme-trik\ adjective

—bo·lo·met·ri·cal·ly \-tri-k(ə-)lē\ adverb