Breadcrumb Home > Dictionary > Index O oceanarium: Meaning and Definition of Find definitions for: o•cea•nar•i•um Pronunciation: (ō"shu-nâr'ē-um), [key] — pl. -nar•i•ums, -nar•i•a a large saltwater aquarium for the display and observation of fish and other marine life. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ocean oceanaut TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: praedial Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language