/ Dictionary / Index T tetragonal: Meaning and Definition of Find definitions for: te•trag•o•nal Pronunciation: (te-trag'u-nl), [key] — adj. pertaining to or having the form of a tetragon. noting or pertaining to a system of crystallization in which all three axes are at right angles to one another, two being equal in length and the third being of a different length. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tetragonal (Thesaurus) tetragon tetragonal trisoctahedron 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