/ Dictionary / Index Z Zircoloy: Meaning and Definition of Find definitions for: Zir•co•loy Pronunciation: (zûr'ku-loi"), [key] — Trademark. Trademark. a zirconium alloy used in structural elements or tubing in nuclear reactors. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ziram zircon Related Content Daily Word Quiz: gossamer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language