Merriam-Webster Collegiate Dictionary - septuagint

 noun  Etymology: Late Latin ~a, from Latin, seventy, irregular from septem seven + -ginta (akin to Latin viginti twenty); from the approximate number of its translators — more at seven, vigesimal  Date: 1633 a Greek version of the Jewish Scriptures redacted in the third and second centuries B.C. by Jewish scholars and adopted by Greek-speaking Christians  • ~al adjective