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progeria (n.)

fatal genetic disease of children causing rapid aging, 1902, Modern Latin, from Greek progeros "prematurely old;" from pro "before, sooner" (see pro-) + geras "old man" (see geriatric) + abstract noun ending -ia.

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Definitions of progeria from WordNet

progeria (n.)
a rare abnormality marked by premature aging (grey hair and wrinkled skin and stooped posture) in a child;
From wordnet.princeton.edu