Main definitions of coma in English

: coma1coma2

coma1

noun

  • A state of deep unconsciousness that lasts for a prolonged or indefinite period, caused especially by severe injury or illness.

    ‘a road crash left him in a coma’
    figurative ‘a victim of a legislative coma’
    • ‘Conversely, the recovery of people from what we would call comas or deep sleep could be interpreted as an example of miraculous resurrection, perhaps accounting in part for the enduring popularity of saintly healing.’
    • ‘In one plot a taxi driver, who doesn't realise that he has diabetes despite having the classic symptoms, collapses into a coma in his car.’
    • ‘Reye's syndrome can eventually lead to a coma and brain death.’
    • ‘The four-year-old was carried into the hospital in a deep coma, with a high temperature and a high level of malaria parasite in his bloodstream.’
    • ‘The highest possible score is 15, and the lowest possible score is three, which indicates the most severe, deep coma.’
    • ‘Hyperglycemia is a condition in which the blood sugar is high and the person may go into a diabetic coma stage.’
    • ‘Severe toxicity leads to coma, profound hypotension, bradycardia, and asystolic arrest.’
    • ‘More recently, some clinicians have tried to induce comas in patients whose brain damage doesn't come from a head injury.’
    • ‘Isn't it time you were lured into a prolonged, sophisticated coma?’
    • ‘After sustaining a severe heart attack in 1973, my grandmother sank into a deep coma and was placed on life support systems in the hospital.’
    • ‘Headache, fever and drowsiness can lead to a deep coma but only very rarely.’
    • ‘Her doctors induced a coma in order to stop the spread of the infection.’
    • ‘This is often associated with deep and prolonged coma.’
    • ‘People can recover from comas, but not brain death.’
    • ‘Only patients with severe brain trauma, in a deep coma, do not respond.’
    • ‘Every now and then people in a deep coma are wrongly declared dead, and survive the experience.’
    • ‘He had been in a deep coma at the Royal Hospital for Neurodisability after suffering severe brain damage.’
    • ‘To treat a patient in a diabetic coma in hospital is also far more expensive than to provide maintenance doses of insulin.’
    • ‘There were several other rushed trips in ambulances to hospitals, going into comas and not knowing whether she'd come out.’
    • ‘A large pulse through his brain sent him into a deep coma in which he slept for days.’
    unconsciousness, insensibility, stupor, oblivion, inertia
    blackout, collapse, torpor, trance
    persistent vegetative state, pvs
    sopor
    View synonyms

Origin

Mid 17th century: modern Latin, from Greek kōma deep sleep; related to koitē bed and keisthai lie down.

Pronunciation:

coma

/ˈkōmə/

Main definitions of coma in English

: coma1coma2

coma2

noun

Astronomy
  • 1A diffuse cloud of gas and dust surrounding the nucleus of a comet.

    • ‘As it approaches the Sun, heat causes ices in the nucleus to sublimate, creating a cloud of gas and dust known as the coma.’
    • ‘Since comets are mostly composed of ices, their outer layer vaporises as they approach the Sun, forming a cloud of gas and dust called the coma, which gives them a fuzzy appearance.’
    • ‘Rosetta's instruments will analyse the gases and dust grains in the coma that forms when the comet becomes active, as well as the interaction with the solar wind.’
    • ‘The second explanation is that the X-rays are just solar X-rays scattered by the dust present in the coma.’
    • ‘He had acquired some sand in his pockets, and now he was charging them up and releasing them into the air like the coma of a comet.’
    1. 1.1Optics Aberration that causes the image of an off-axis point to be flared like a comet.
      • ‘These Seidel sums correspond to spherical aberration, coma, astigmatism, Petzval curvature and distortion.’
      • ‘For the first time in optical design, aberration, diffraction and coma were described and understood.’
      • ‘The light from the null corrector goes to the mirror under test, and the alignment consists of pointing the corrector so that the return image is free of coma.’

Origin

Early 17th century (as a botanical term): via Latin from Greek komē hair of the head.

Pronunciation:

coma

/ˈkōmə/