Tome

 WORD OF THE DAY

tome / noun / TOHM

Definition
1: book, especially a large or scholarly book
2: a volume forming part of a larger work
3a: part 
3b: segment
4: cutting instrument

Examples
The tome is split into three sections by timeline, covering the golden age of the 1900s-’30s, the 1940s-’60s midcentury years, and the horror boom across the 1970s-2000s.
— Adam Rowe, Forbes, 1 Jan. 2022

Tuesday’s meeting will be the first of three chances in the next two months for the council to make amendments to the Comprehensive Plan, the massive tome most recently adopted in 2006 and amended in 2011.
— Washington Post, 3 Mar. 2021

Did You Know?
Tome comes from Latin tomus, which comes from Greek tomos, meaning "section" or "roll of papyrus."
Tomos is from the Greek verb temnein, which means "to cut." In ancient times, some of the longest scrolls of papyrus occasionally were divided into sections.
When it was first used in English in the 16th century, tome was a book that was a part of a multi-volume work or a major part of a single-volume book.
Now a tome is most often simply a large and often ponderous book.