life-support_system
1. [ noun ] equipment that makes life possible in otherwise deadly environmental conditions
Synonyms: life_support
Examples:

"the astronauts relied on their life-support systems"

Related terms: equipment
2. [ noun ] medical equipment that assists or replaces important bodily functions and so enables a patient to live who otherwise might not survive
Synonyms: life_support
Examples:

"the patient is on life support"

Related terms: equipment