/ Dictionary / Index S sphragistics: Meaning and Definition of Find definitions for: sphra•gis•tics Pronunciation: (sfru-jis'tiks), [key] — n. (used with a sing. v.) the scientific study of seals or signet rings. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sphragistic sp. ht. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language