thermophilic, thermophillic 1. A reference to growing best at or having a fondness for high temperatures. 2. Literally, heat-loveing; describing certain microorganisms (thermophiles) whose optimal growth occurs at temperatures of 50°C or more. Thermophilic bioprocesses can be employed as an energy source. 3. Describing microorganisms that requi... Found on http://www.wordinfo.info/words/index/info/view_unit/4265/25