Definition of portiforium in US English:

portiforium

noun

  • A portable breviary used in the Middle Ages; = porteous.

Origin

Late Middle English. From post-classical Latin portiforium portable breviary from classical Latin portāre + forīs out of doors, outside.

Pronunciation

portiforium

/ˌpɔːtɪˈfɔːrɪəm/