/ Dictionary / Index S swellhead: Meaning and Definition of Find definitions for: swell•head Pronunciation: (swel'hed"), [key] — n. a vain or arrogant person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: swellhead (Thesaurus) swell front swelling Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language