Real Dictionary

Teleprompter
countable noun: A Teleprompter is a device used by people speaking on television or at a public event, which displays words for them to read.

teleprompter in American English
an electronic device that, unseen by the audience, scrolls a prepared speech, script, etc. line by line, as a prompting aid to a speaker or actor on television
noun: a brand name for an off-camera device that displays a magnified script so that it is visible to the performers or speakers on a television program

Teleprompter in British English
noun: an electronic television prompting device whereby a prepared script, unseen by the audience, is enlarged line by line for the speaker