Breadcrumb Home > Dictionary > Index T tephra: Meaning and Definition of Find definitions for: teph•ra Pronunciation: (tef'ru), [key] — n. (used with a pl. v.) clastic volcanic material, as scoria, dust, etc., ejected during an eruption. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tephillin tephrite ✖ Related Content Daily Word Quiz: quadrumanous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language