biblebi‧ble, Bible /ˈbaɪbəl/ noun 
1the Bible the holy book of the Christian religion, consisting of the Old Testament and the New Testament2[countable] a copy of the bible3[singular] informal the most useful and important book on a particular subject: 
It's the anatomy student's bible!
1the Bible the holy book of the Christian religion, consisting of the Old Testament and the New Testament2[countable] a copy of the bible3[singular] informal the most useful and important book on a particular subject: It's the anatomy student's bible!