teaser

noun

1. a person or thing that teases.
2. Theater. a drapery or flat piece across the top of the proscenium arch that masks the flies and that, together with the tormentors, forms a frame for the stage opening.
3. Printing, Journalism. kicker(def 9).
4. an advertisement that lures customers or clients by offering a bonus, gift, or the like.
5. Television Slang. tease(def 5).

noun

1. a person who teases
2. a preliminary advertisement in a campaign that attracts attention by making people curious to know what product is being advertised
3. a difficult question
4. vet science a vasectomized male animal, such as an ox, used to detect oestrus in females

n.“short sample, introductory advertisement,” 1934, agent noun from tease (v.).