/ Dictionary / Index X xeroderma pigmentosum: Meaning and Definition of Find definitions for: xeroder'ma pig•men•to'sum Pronunciation: (pig"mun-tō'sum), [key] — Pathol. Pathol. a rare inherited disease characterized by sensitivity to ultraviolet light, exposure resulting in lesions and tumors of the skin and eyes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. xeroderma xerography Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language