Teaser \Teas"er\, n. (Elec.) A shunt winding on field magnets for maintaining their magnetism when the main circuit is open.
Source: Webster's Revised Unabridged Dictionary (1913)
Teaser \Teas"er\, n.1. One who teases or vexes.
2. (Zo["o]l.) A jager gull. [Prov. Eng.]