IPA: /ˈθɜːrməʊˌsteɪbəl/
KK: /ˈθɜrməˌsteɪbəl/
Not affected by high temperatures and able to maintain its properties when heated.
The enzyme is thermostable, allowing it to function even at elevated temperatures.
Thermostable is formed from "thermo-" (from Greek "thermos", meaning heat) and "stable" (from Latin "stabilis", meaning standing firm or fixed). The word describes something that remains stable or unchanged when exposed to heat.
Think of 'heat' ('thermo-') and something that 'stands firm' ('stable') — that's why thermostable means something that stays unchanged when heated.