Definition for Hyperthermophilic bacteria
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A hyperthermophile is an organism that thrives in extremely hot environments— from 60 degrees C (140 degrees F) upwards. An optimal temperature for the existence of hyperthermophiles is above 80°C (176°F). Hyperthermophiles are a subset of extremophiles, micro-organisms within the domain Archaea, although some bacteria are able to tolerate temperatures of around 100°C (212°F), as well. Many hyperthermophiles are also able to withstand other environmental extremes such as high acidity or radiation levels.