Source : Webster's Revised Unabridged Dictionary (1913)

Teaser \Teas"er\, n. (Elec.)
   A shunt winding on field magnets for maintaining their
   magnetism when the main circuit is open.

Teaser \Teas"er\, n.
   1. One who teases or vexes.

   2. (Zo["o]l.) A jager gull. [Prov. Eng.]

Source : WordNet®

teaser
     n 1: a worker who teases wool
     2: someone given to teasing (as by mocking or stirring
        curiosity) [syn: {tease}, {annoyer}, {vexer}]
     3: an advertisement that offers something free in order to
        arouse customers' interest
     4: a particularly baffling problem that is said to have a
        correct solution; "he loved to solve chessmate puzzles";
        "that's a real puzzler" [syn: {puzzle}, {puzzler}, {mystifier}]
     5: an attention-getting opening presented at the start of a
        television show
     6: a flat at each side of the stage to prevent the audience
        from seeing into the wings [syn: {tormenter}, {tormentor}]
     7: a device for teasing wool; "a teaser is used to disentangle
        the fibers"