Ecclesiasticus is another name for the book called Wisdom of Jesus ben Sirach. Some Christian traditions include this book in the Old Testament. Other traditions value it as ancient Jewish wisdom but do not treat it as Scripture.
Bible dictionary
Ecclesiasticus
The International Standard Bible Encyclopedia (1915)The classic article on this subjectSmith’s Bible Dictionary (1863)The entry on this subject
Adapted by Mission Mutual (Aquifer Open Bible Dictionary) from Tyndale Open Bible Dictionary © 2023 Tyndale House Publishers. CC BY-SA 4.0. About the sources