Slider

Noun

1. Agent noun of slide: that which slides. A potentiometer with a linearly sliding control. A widget allowing the user to select a value or position on a sliding scale. A sliding door. A pitch thrown with added pressure by middle and ring fingers yielding a combination of backspin and sidespin, resulting in a motion to the left when thrown by a right handed pitcher.

   "The closer had a wicked slider that was almost unhittable."

2. A potentiometer with a linearly sliding control.
3. A widget allowing the user to select a value or position on a sliding scale.
4. A sliding door.
5. A pitch thrown with added pressure by middle and ring fingers yielding a combination of backspin and sidespin, resulting in a motion to the left when thrown by a right handed pitcher.

   "The closer had a wicked slider that was almost unhittable."