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English definition of “life-support system”

life-support system

noun [C] uk   /ˈlaɪf.səˌpɔːtˌsɪs.təm/ us    /-ˌɔːrt-/
the equipment used to keep a person alive when they are very ill or injured: He's been on a life-support system since the crash. the natural structures and systems that are necessary for living things, especially humans, to be able to live: The lack of rain is threatening all the region's life-support systems (= the Earth, trees and rivers).
(Definition of life-support system from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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