a website or section of a website that is used for public discussion of a specific topic and on which users can submit or read messages: You should post your questions on a parenting message board and get support from other parents.
an online discussion group that is maintained on such a website: To participate in the message board, you must be a registered user.
Also called discussion board, forum.
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British Dictionary definitions for message board
an internet discussion forum
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