/ Dictionary / Index T tetrabasic: Meaning and Definition of Find definitions for: tet•ra•ba•sic Pronunciation: (te"tru-bā'sik), [key] — adj. Chem. (of an acid) having four atoms of hydrogen replaceable by basic atoms or groups. containing four basic atoms or groups having a valence of one. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetra tetrabrach Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language