Breadcrumb Home > Dictionary > Index R radioactive series: Meaning and Definition of Find definitions for: ra'dioac'tive se'ries Pronunciation: [key] — Physics, Chem. Physics,Chem. a succession of elements initiated in the radioactive decay of a parent, as thorium or uranium, each of which decays into the next until a stable element, usually lead, is produced. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radioactive fallout radioactive waste 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: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language