/ Dictionary / Index S seif: Meaning and Definition of Find definitions for: seif Pronunciation: (sāf, sīf), [key] — n. a long narrow sand dune parallel to the prevailing wind direction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seidlitz powders Seifert Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language