Breadcrumb Home > Dictionary > Index I index fossil: Meaning and Definition of Find definitions for: in'dex fos"sil Pronunciation: [key] — Geol., Paleontol. Geol.,Paleontol. a widely distributed fossil, of narrow range in time, regarded as characteristic of a given geological formation, used esp. in determining the age of related formations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. index finger index fund TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: variegate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language