the.com/coma

means A coma is a deep, prolonged state of unconsciousness in which a person cannot be woken and does not respond normally to stimuli, pain, light, or sound.

from From Greek 'koma,' meaning deep sleep or deep slumber — a word the ancient physician Hippocrates and later Galen used for pathological drowsiness. It passed into Latin medical writing largely unchanged and entered English in the 17th century as a technical term for unnatural, unrousable sleep. It's unrelated to the astronomical/comet 'coma' (the fuzzy cloud around a comet's nucleus), which comes instead from Latin 'coma' meaning hair — a completely different word that just happens to look identical.