Coma comes from Greek kōma (deep sleep), related to the same root that gave English cemetery — both words encode the ancient metaphor of death and unconsciousness as sleep.
A prolonged state of deep unconsciousness, caused by injury, disease, or poison.
From Greek kōma (κῶμα), meaning 'deep sleep, lethargy,' related to koiman (to put to sleep) and koimeterion (sleeping place), which gives English the word cemetery. The connection between coma and cemetery is hidden in plain sight: both come from the Greek concept of deep sleep. Key roots: koiman (Greek: "to put
Coma and cemetery are etymological siblings. Greek koimeterion (sleeping place) became cemetery because early Christians called their burial grounds 'sleeping places,' reflecting their belief that death was temporary sleep before resurrection. A coma and a cemetery are both, etymologically, places of sleep.