teaser

noun

1. One who teases or pokes fun.
2. (textile treatment) A person or thing that teases.
3. A preview or part of a product released in preparation of its main advertising, typically a short film, song or quote.
4. A kind of gull, the jaeger.
5. A shunt winding on field magnets for maintaining their magnetism when the main circuit is open.
6. The stoker of a glassworks furnace.
7. A short horizontal curtain used to mask the flies and frame the top of the inner stage opening, adjustable to the desired height.