peculium (p??kju?l??m) n (Historical Terms) Roman law property that a father or master allowed his child or slave to hold as his own[C17: from Latin; see peculiar]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014peculiumRoman Law. property that might be held by a son, wife, or slave.See also: Property and Ownership-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.