thermostable

adjective Biochemistry.

1. capable of being subjected to a moderate degree of heat without loss of characteristic properties, as certain toxins and enzymes (opposed to thermolabile).

adjective

1. (of certain chemical and biochemical compounds) capable of withstanding moderate heat without loss of characteristic propertiesa thermostable plastic Compare thermolabile
2. not affected by high temperatures

adj.

1. Unaffected by relatively high temperatures, as certain ferments or toxins.