/ Dictionary / Index S sick headache: Meaning and Definition of Find definitions for: sick' head'ache Pronunciation: [key] migraine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sickert sickie Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language