stylebook

UK: /ˈstaɪlˌbʊk/ US: (stīl′bŏŏk′)

WordReference Random House Unabridged Dictionary of American English © 2025

style•book  (stīl′bŏŏk′), n. 

1. Printing, Journalism a book containing rules of usage in typography, punctuation, etc., employed by printers, editors, and writers.
2. Clothing a book featuring styles, fashions, or the rules of style.

• style + book 1700–10

Collins Concise English Dictionary © HarperCollins Publishers::

stylebook / ˈstaɪlˌbʊk/ noun

1. a book containing rules and examples of punctuation, typography, etc, for the use of writers, editors, and printers