a page larger than the trim size of a magazine or book, folded one or more times so as not to extend beyond the pages; gatefold.
that must be unfolded to be used, read, viewed, etc.: a cabinet with a foldout table.
Origin of foldout
First recorded in 1945–50; noun, adj. use of verb phrase fold out
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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