A manuscript volume, especially of a classic work or of the Scriptures.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "codex" in a sentence
"In the vellum codex, though each leaf might have only one fold, and thus technically be considered as a folio, the actual shape of it was nearly square, hence its name of _codex quadratus_."
"“My brother continues to use the word codex to describe the Shroud,” Anne said."
"The term codex is something of a misnomer but it has become standard usage."