AB BET DIN (Jewish Encyclopedia)

From BibleWiki

1. Title, according to some scholars, of the judge next in authority to the nasi (prince or president), and who would, accordingly, be vice-president of the Sanhedrin. On the disputed question of the relation of the Ab bet din to the nasi, see Nasi. 2. In recent times, the title of the chief assessor at the rabbinical court.