/ Dictionary / Index T thyself: Meaning and Definition of Find definitions for: thy•self Pronunciation: (ī-self'), [key] — pron. an emphatic appositive to thou or thee. a substitute for reflexive thee. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thysanuran Thyssen Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language