life-support system is a noun meaning "equipment that makes life possible in otherwise deadly environmental conditions". It carries 2 recorded senses.
equipment that makes life possible in otherwise deadly environmental conditions
“the astronauts relied on their life-support systems”
medical equipment that assists or replaces important bodily functions and so enables a patient to live who otherwise might not survive
“the patient is on life support”
Definitions, synonyms and semantic relations for life-support system come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.