/ Dictionary / Index A Addison's disease: Meaning and Definition of Find definitions for: Ad'dison's disease" Pronunciation: [key] — Pathol. Pathol. a disease characterized by asthenia, low blood pressure, and a brownish coloration of the skin, due to decreased secretion of cortisol from the adrenal cortex, resulting in hypoadrenalism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Addisonian additament Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language