- of or relating to Japheth.
- of or relating to a hypothesized group of languages of the Caucasus, Mesopotamia, Asia Minor, and southern Europe, including the Caucasian languages, Sumerian, Basque, and Etruscan, formerly thought by some to represent a stage in language development that preceded the development of Indo-European and Semitic.
- denoting a discredited grouping of languages that postulated a relationship between Basque, Etruscan, and Georgian among others
