/ Dictionary / Index T tetartohedral: Meaning and Definition of Find definitions for: te•tar•to•he•dral Pronunciation: (ti-tär"tō-hē'drul), [key] — adj. (of a crystal) having one fourth the planes or faces required by the maximum symmetry of the system to which it belongs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetany tetched Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language