Breadcrumb Home > Dictionary > Index U understratum: Meaning and Definition of Find definitions for: un•der•stra•tum Pronunciation: (un'dur-strā"tum, -strat"um), [key] — pl. -stra•ta -strat•ums. a substratum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. understrapper understrength 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: rosarium Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language