Rollerball

Origin

roller + ball

Full definition of rollerball

Noun

1. A kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.
• 2009, August 30, Laurie Winer, Keeping Score, The office is full of rumpled clothes and bad haircuts; it’s an operation at which rollerball pens fall outside the budget limit (Bics for everyone!)
2. (computing) A trackball.