/ Dictionary / Index Z zircon: Meaning and Definition of Find definitions for: zir•con Pronunciation: (zûr'kon), [key] — n. a common mineral, zirconium silicate, ZrSiO, occurring in small tetragonal crystals or grains of various colors, usually opaque: used as a refractory when opaque and as a gem when transparent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: zircon (Thesaurus) Zircoloy zirconium Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language