coma
noun
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a state of deep and often prolonged unconsciousnessโAfter the accident, I was in a coma for three weeks.โcomatoseness
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the luminous cloud of particles surrounding the frozen nucleus of a cometโThe comet was so close, you could see the coma during the day.โ
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a usually terminal tuft of bracts, such as in the pineapple, or tuft of hairs, especially on certain seedsโThe cotton plant has a coma on its seed.โ