phylacto-, phylact-, phylac-, phylax-

(Greek: guard, protect, preserve)

tachyphylaxis
1. Rapid immunization to a toxic dose of a substance by previously injecting tiny doses of the same substance.
2. Rapid appearance of progressive decrease in response following repetitive administration of a pharmacologically or physiologically active substance.
3. Also known as tachysynethis.
thermophylactic
Heat-resistant; tolerant of high temperatures.