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Subject to destruction, decomposition, or inactivation by heating, as an enzyme or toxin.
ther′mo·la·bil′i·ty (-bĭl′ĭ-tē) n.
(Chemistry) (of certain biochemical and chemical compounds) easily decomposed or subject to a loss of characteristic properties by the action of heat: a thermolabile enzyme. Compare thermostable1
[C20: from thermo- + labile]
ther•mo•la•bile(ˌθɜr moʊˈleɪ bɪl, -baɪl)
subject to destruction or loss of characteristic properties by the action of moderate heat, as certain toxins and enzymes (opposed to thermostable).