Breadcrumb Home > Dictionary > Index T terra firma: Meaning and Definition of Find definitions for: ter'ra fir'ma Pronunciation: (fûr'mu), [key] firm or solid earth; dry land (as opposed to water or air). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. terra cotta terraform ✖ Related Content Daily Word Quiz: dishabille Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language