/ Dictionary / Index H hiatus hernia: Meaning and Definition of Find definitions for: hia'tus her'nia Pronunciation: [key] — Pathol. Pathol. an abnormal condition in which part of the stomach protrudes upward through the esophageal cleft in the diaphragm, sometimes causing a backflow of acid stomach contents into the esophagus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hiatus Hiawatha Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language