definitions of tome:
1. a volume forming part of a larger work
2. book; especially: a large or scholarly book
origin:
Middle French or Latin; Middle French, from Latin tomus,from Greek tomos section, roll of papyrus, tome, fromtemnein to cut; akin to Middle Irish tamnaid he lops, Polishciąć to cut, and perhaps to Latin tondēre to shear. First known use: 1519.
(definitions and origin from merriam-webster.com)
once upon a tome 