/ Dictionary / Index T thermosetting: Meaning and Definition of Find definitions for: ther•mo•set•ting Pronunciation: (thûr'mō-set"ing), [key] — adj. pertaining to a type of plastic, as the urea resins, that sets when heated and cannot be remolded. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thermosetting (Thesaurus) thermosensitive thermosiphon Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language