The Collaborative International Dictionary
Pyrometrical
Pyrometric \Pyr`o*met"ric\, Pyrometrical \Pyr`o*met"ric*al\ a. [Cf. F. pyrom['e]trique.] (Physics) Pertaining to, or obtained by, the pyrometer; as, pyrometrical instruments; pyrometrical measurements.
Wiktionary
pyrometrical
a. pyrometric