/ Dictionary / Index T thuja: Meaning and Definition of Find definitions for: thu•ja Pronunciation: (th'ju), [key] — n. any tree of the genus Thuja, comprising the arborvitaes. the wood of the sandarac tree. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thuja (Thesaurus) thuggee Thule Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language