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| a punctuation mark (,) used to indicate the separation of elements within the grammatical structure of a sentence | |||
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| [in astronomy] the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed | |||
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| acquired encephalopathy following acute viral infections (especially influenza or chicken pox) in young children; characterized by fever, vomiting, disorientation, coma, and fatty infiltration of the liver | |||
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| a state of deep and often prolonged unconsciousness; usually the result of disease or injury |