/ Dictionary / Index S swelled head: Meaning and Definition of Find definitions for: swelled' head' Pronunciation: [key] an inordinately grand opinion of oneself; conceit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. swell box swellfish Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language