Note: Do not rely on this information. It is very old.
Codex
Codex (Lat. a set of wooden tablets, hence a book) is a term applied to any MS., but especially to any of the authentic MSS. of the Christian Gospels, which have been discovered in divers places and at various times. These discoveries have thrown valuable light on many critical points, and are of great interest to Biblical students. In France the Codex signifies an authorised body of medical formulae.