Siddur is an abbreviation of siddur ha-tefillot, meaning "the order of prayers," having been used since the late Middle Ages to describe any kind of rabbinic prayer book. The geonim of the 9-10th centuries produced the first such compositions, which expanded in coverage, physical format, and the recording of various rites in manuscript codices and early printed editions. When 19th-century forms of Judaism emerged, the siddur became the vehicle for innovative content, presentation and style.

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The word siddur (Hebrew: סידור) bears the sense of “order” and is commonly used to…