/ Dictionary / Index H hypethral: Meaning and Definition of Find definitions for: hy•pe•thral Pronunciation: (hi-pē'thrul, hī-), [key] — adj. (of a classical building) wholly or partly open to the sky. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypethral (Thesaurus) hypesthesia hypha Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language