copyholder

noun

1. a person or thing that holds copy.
2. a device for holding copy in its place, as on a printer’s frame or on a typewriter.
3. a proofreader’s assistant who reads copy aloud or follows it while proof is read for the detection of deviations from it in proof.
4. a person who holds an estate in copyhold.

noun

1. printing one who reads aloud from the copy as the proof corrector follows the reading in the proof
2. printing a device that holds copy in place for the compositor
3. law (formerly) a person who held land by copyhold tenure