bookholder

From book +‎ holder.

bookholder (plural bookholders)

1. A support for a book, holding it open for reading or copying.
2. Someone who holds a book.
3. (obsolete) A prompter at a theatre.
   • 1623 (first performance), John Fletcher, William Rowley, “The Maid in the Mill”, in Comedies and Tragedies […], London: […] Humphrey Robinson, […], and for Humphrey Moseley […], published 1647, →OCLC, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals):

     they are out of their parts, sure: it may be 'tis the book-holder's fault

• book-holder

• “bookholder”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.