/ Dictionary / Index A altitude sickness: Meaning and Definition of Find definitions for: al'titude sick"ness Pronunciation: [key] — Pathol. Pathol. a condition affecting some persons at high altitudes, caused by insufficient oxygen in the blood and characterized by dizziness, nausea, and shortness of breath. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. altitude dial altitudinal Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language