Breadcrumb Home > Dictionary > Index O Cite octad: Meaning and Definition of Find definitions for: oc•tad Pronunciation: (ok'tad), [key] — n. a group or series of eight. an element, atom, or group having a valence of eight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: octad (Thesaurus) octachord octadecanoic acid 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: obviate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language