## Etymology
A compound of day and book, attested from the 16th century, originally a bookkeeper's book in which the day's transactions were recorded before being posted to the ledger. Both elements descend from Old English (dæg, bōc).

## AI Etymology
Daybook is a compound of day and book, attested from the 16th century, originally a bookkeeper's book in which the day's transactions were recorded before being posted to the ledger. Both elements descend from Old English (dæg, bōc). The ancestry passes through Old English dæg and Old English bōc. In present use as a noun, it means "a book for recording daily transactions or events", keeping the historical formation close to the word's ordinary semantic work. As a compound, its meaning is assembled from the two visible parts rather than from an opaque borrowing. Related words include day and book.

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