Breadcrumb Home > Dictionary > Index A Cite Abbe number: Meaning and Definition of Find definitions for: Ab'be num"ber Pronunciation: [key] — Optics. Optics. the reciprocal of the dispersive power of a substance. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Abbe condenser abbess TrendingHere are the facts and trivia that people are buzzing about. January 2021 Current Events: US News The Holocaust (1933–1945) Chinese New Year History, Meaning, and Celebrations Noble Titles and Ranks in a Monarchy The 5 Best Air Purifiers of 2020 Inaugural Trivia Related Content Daily Word Quiz: jerrybuilt Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language