coma

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coma
  • 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)
  • noun
    A diffuse cloud of gas and dust surrounding the nucleus of a comet. (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.)

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