IPA: /ˈlɒɡbʊk/
KK: /ˈlɔgˌbʊk/
A book used to keep a record of events, activities, or observations, often with regular entries.
The captain wrote the daily activities in the logbook during the voyage.
Logbook → The word is formed from "log" (from Old English *logg*, meaning a piece of wood or timber) and "book" (from Old English *bōc*, meaning a written work or document). A logbook is a written record of events or activities, often related to navigation or operations, typically kept in a book format.
Think of a 'piece of wood' ('log') being used to keep a 'written record' ('book') of important events. This helps you remember that a logbook is a record of activities.