Definition from Wiktionary, the free dictionary
rollerball (plural rollerballs)
- A kind of ballpoint pen with a spherical nib that uses water-based liquid or gelled ink.
2009 August 30, Laurie Winer, “Keeping Score”, New York Times:
- 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!)
- (computing) A trackball.