Definition of Midnight children
Midnight children: Term applied sometimes to children with xeroderma pigmentosum, a genetic disease with such extraordinary sensitivity to sunlight that ordinary sun exposure results in the development of skin cancer at a very early age. Children with xeroderma pigmentosum (XP) can only play outdoors safely after nightfall.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012
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