thermophile

https://doi.org/10.1351/goldbook.T06333
An organism that can tolerate high temperatures and that grows optimally at temperatures above \(45\ ^{\,\unicode{x26ac}}\text{C}\).
Source:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 166 [Terms] [Paper]