Definition of John, St in English:

1An Apostle, son of Zebedee and brother of James; known as St John the Evangelist or St John the Divine. He has traditionally been credited with the authorship of the fourth Gospel, Revelation, and three epistles of the New Testament. Feast day, 27 December.

1. 1.1 The fourth Gospel.
   See gospel (sense 2)
2. 1.2 Any of the three epistles of the New Testament attributed to St John.
   （被认为是圣约翰撰写的）使徒书信