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Meaning of dermatographia

der•mat•o•graph•i•a

Pronunciation: (dur-mat"u-graf'ē-u, dûr"mu-tu-), [key]
— n. Med.
  1. a condition in which touching or lightly scratching the skin causes raised, reddish marks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.