Breadcrumb Home > Dictionary > Index A Cite abaptiston: Meaning and Definition of Find definitions for: ab•ap•tis•ton Pronunciation: (ab"ap-tis'tun), [key] — n. a cone-shaped trephine designed to avoid penetration of the brain when incising the skull. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. abandonee à bas* 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: lyceum Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language