xenoglossia

xenoglossy (ˈzɛnəˌɡlɒsɪ)

/ (ˌzɛnəˈɡlɒsɪə) /

noun

an ability claimed by some mediums, clairvoyants, etc, to speak a language with which they are unfamiliar

Word Origin for xenoglossia

C20: from Greek, from xeno- + Attic Greek glossa tongue, language