/ (ˈsuːpərˌɔːltə) /
Christianity a consecrated portable stone slab for use on an unconsecrated altar
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
Examples from the Web for superaltar
Superaltar, sū′pėr-awlt-ar, n. a small slab of stone used as a portable altar, to be laid on the top of an unconsecrated altar.