hyperthermophile

From hyper- +‎ thermophile.

hyperthermophile (plural hyperthermophiles)

1. (biology) An organism that lives and thrives in an extremely hot environment, such as a deep sea smoker vent; often a member of the Archaea.
   • 2003, Bill Bryson, A Short History of Nearly Everything, BCA, page 208:

     Meanwhile, scientists were finding even hardier microbes, now known as hyperthermophiles, which demand temperatures of 80 degrees Celsius or more.

• hyperthermophilic
• thermophile