/ Dictionary / Index T tephroite: Meaning and Definition of Find definitions for: teph•ro•ite Pronunciation: (tef'rō-īt"), [key] — n. a mineral, silicate of manganese, MnSiO, occurring in orthorhombic crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tephrochronology Tepic Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language