| night sweats | Profuse sweating at night, occurring in pulmonary tuberculosis and other chronic debilitating affections with low-grade fever. (05 Mar 2000) |
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| night-terrors | A disorder allied to nightmare, occurring in children, in which the child awakes screaming with fright, the distress persisting for a time during a state of saemiconsciousness. Synonym: pavor nocturnus, sleep terror. (05 Mar 2000) |
| night vision | Vision when the eye is dark-adapted. See: dark adaptation, dark-adapted eye. Synonym: night vision, rod vision, scotopia, twilight vision. (05 Mar 2000) |