Sentence:  The Septuagint (LXX) Greek was considered by the rabbis as the only language capable of serving as a translation of the Hebrew...In rabbinic interpretation, <WSD>Japheth</WSD> represented the Greeks, Shem the Hebrews. 
Meaning of the word marked with <WSD> tags:  The third son of Noah, brother to Shem and Ham, who received a blessing from God with Shem, considered to be the ancestor of the Japhetic people(s) (associated approx. with Indo-Europeans).