baseplate
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baseplate
(ˈbeɪsˌpleɪt)n
a flat supporting plate or frame at the base of a column, designed to distribute the column's weight over a greater area and provide increased stability
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014