codex
noun /ˈkəʊdeks/
  /ˈkəʊdeks/
 (plural codices 
 /ˈkəʊdɪsiːz/,  /ˈkɒdɪsiːz/
  /ˈkəʊdɪsiːz/,  /ˈkɑːdɪsiːz/
, codexes)- an ancient text in the form of a bookTopics Literature and writingc2
 - an official list of medicines or chemicals
 
Word Originlate 16th cent. (denoting a collection of statutes): from Latin, literally ‘block of wood’, later denoting a block split into leaves or tablets for writing on, hence a book. See code.