/ Dictionary / Index O obsidian dating: Meaning and Definition of Find definitions for: obsid'ian dat"ing Pronunciation: [key] — Archaeol. Archaeol. a method of dating obsidian artifacts or debitage by calculating how long it has taken to produce a given thickness of a hydration layer within such matter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. obsidian obsidional coin Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language