Breadcrumb Home > Dictionary > Index O optical rotation: Meaning and Definition of Find definitions for: op'tical rota'tion Pronunciation: [key] — Physical Chem. Physical Chem. the angle at which the plane of polarized light is rotated when passed through an optically active substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. optical pumping optical scanning 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: jingoism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language