1rare A person who designs the title sequence and title cards for a film; a title designer. Also: a person who adds a caption or title to a magic lantern slide or a photographic negative.
2A device used to add captions or titles to film or video recordings; (originally) specifically an adjustable frame fixed to a film camera that allows title cards to be placed securely in front of the camera (now historical).
Late 16th century (in an earlier sense). From title + -er.