found: Catholic encyc. WWW site, May 18, 2006:Kiss page ("... in about the twelfth or thirteenth century the use of the instrumentum pacis, or osculatorium, known in English as the pax-board or pax-brede, was gradually introduced. This was a little plaque of metal, ivory, or wood, generally decorated with some pious carving and provided with a handle, which was first brought to the altar for the celebrant to kiss at the proper place in the Mass and then brought to each of the congregation in turn at the altar rails.")
found: Oxford dict. of the Christian church, 1957("pax brede, also pax or osculatorium")
found: OED online, May 18, 2006("pax: a tablet of gold, silver, ivory, etc., with a projecting handle, depicting the crucifixion or other sacred subject, which is kissed by the celebrating priest and then by the other participants at a mass; an osculatory"; paxboard; paxbred)