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oceanarium

[oh-shuh-nair-ee-uh m]
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noun, plural o·cea·nar·i·ums, o·cea·nar·i·a [oh-shuh-nair-ee-uh] /ˌoʊ ʃəˈnɛər i ə/.
  1. a large saltwater aquarium for the display and observation of fish and other marine life.
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Origin of oceanarium

1935–40; ocean + -arium, modelled on aquarium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for oceanarium

oceanarium

noun plural -iums or -ia (-ɪə)
  1. a large saltwater aquarium for marine life
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012