coma

Meanings

1. 1
   noun

   A deep, prolonged state of unconsciousness, usually caused by serious injury or illness.

   After the accident, she was in a coma for three weeks.

2. 2
   noun

   The cloud of dust and gas surrounding the centre of a comet.

   The comet's bright coma was visible even in daylight.

Learned borrowing from Latin coma (“hair of the head”), from Ancient Greek κόμη (kómē, “hair”).

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