the.com/tome

means A large, heavy book, especially a weighty or scholarly one.

from From Greek 'tomos,' meaning a cut or a slice — originally referring to a piece cut from a papyrus roll, i.e., one 'volume' of a larger work. Latin picked it up as 'tomus,' French kept it going, and English borrowed it with the sense narrowing over time to mean specifically a big, hefty book — the slice that became, ironically, the whole slab.