noun
Refers to the second part of the Christian Bible, containing the Gospels, Acts, Epistles, and Revelation.
新約聖書はギリシャ語で書かれた。
The New Testament was written in Greek.
旧約聖書 is the Old Testament, the first part of the Christian Bible, while 新約聖書 is the New Testament.
From 新 (new) + 約 (covenant) + 聖書 (scripture), a direct translation of 'New Testament'.