jeroboam (jĕr-ə-BŌ-əm) Definition (Noun) A large bowl or goblet; a very large wine-bottle. In Context "And a jeroboam of 1945 Mouton-Rothschild – from the private cellar of Baroness Philippine de Rothschild, the château's owner, no less – sold for an astounding $310,700." David Sokolin, Investing in Liquid Assets: Uncorking Profits in Today's Global Wine Market, 2008.