pyrometer
noun
py·rom·e·ter pī-ˈrä-mə-tər 
: an instrument for measuring temperatures especially when beyond the range of mercurial thermometers
pyrometric
ˌpī-rə-ˈme-trik
adjective pyrometrically
ˌpī-rə-ˈme-tri-k(ə-)lē
adverb pyrometry
pī-ˈrä-mə-trē
noun 
Example Sentences
Recent Examples on the Web This instrument, called a radiation pyrometer, resembles a small telescope and is equipped with rock-salt and quartz lenses that screen out all except infrared radiations. 
Popular Mechanics Editors, Popular Mechanics, 17 Dec. 2020
Popular Mechanics Editors, Popular Mechanics, 17 Dec. 2020 Word History
Etymology
International Scientific Vocabulary
First Known Use
1791, in the meaning defined above