coma
In medicine, a state of deep unconsciousness from which the subject cannot be roused. Possible causes include head injury, brain disease, liver failure, cerebral haemorrhage, and drug overdose.
coma
| In optics, one of the geometrical aberrations of a lens or mirror, in which rays from an object not in the centre of the field of view make a comet-shaped spot on the image plane instead of meeting at a point. |
coma
| In astronomy, hazy cloud of gas and dust that surrounds the nucleus of a comet. |
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