One of the mysteries of the English language finally explained.
1A book containing the services of a church; a service book.
2An official record of the proceedings, accounts, members, etc., of a church (in later use especially a nonconformist church).
3A parish register. Now chiefly historical.
Old English; earliest use found in Wulfstan. From church + book. Compare Old Icelandic kirkjubók church deed, church document, Middle Low German kerkenbōk ecclesiastical book, service book, ecclesiastical history.
church book/ˈtʃəːtʃ bʊk/
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