IPA: //ˌθɜːrməˈleɪbaɪl//
KK: /ˌθɜrməˈleɪbaɪl/
Easily damaged or changed when exposed to heat, especially in relation to biochemical substances.
Many enzymes are thermolabile and lose their activity when heated.
Comparative: more thermolabile
Superlative: most thermolabile
Thermolabile is formed from "thermo-" (from Greek "thermos", meaning heat) and "labile" (from Latin "labilis", meaning liable to change or unstable). The word describes something that is unstable or changes when exposed to heat.
Think of 'heat' ('thermo-') making something 'unstable' ('labile') — that's why thermolabile refers to substances that change when heated.
No commonly confused words.