pro'-log, prol'-og (prologos, "foreword," "preface," "introduction"): The word occurs in the preface to Ecclesiasticus (Sirach), and is commonly applied to Jn 1:1-18. See ECCLESIASTICUS; JOHN, GOSPEL OF.
Bibliography Information Orr, James, M.A., D.D. General Editor. "Definition for 'PROLOGUE'". "International Standard Bible Encyclopedia". bible-history.com - ISBE; 1915.