biro

plural biros

1. countableuncountableA Biro brand ballpoint pen.

   Frank's Biro taps delicately at the topmost of the little yellow notes.

   1993, Iain Banks, Complicity, published 2008, unnumbered page

   1 more example

   Biro MARKS A TURNING POINT IN THE HISTORY OF Writing "BIRO" is unique: it writes with a ballpoint — a point that never goes wrong, never floods, bends or splutters — a point that rolls your writing on to the paper with effortless ease. "BIRO" ink dries as you write; you cannot smudge it; you need no blotter. […] Retail price 55/- including purchase tax

   1945 November and December, Railway Magazine, page v, advertisement

2. CommonwealthIrelandUKbroadlycountableuncountableAny ballpoint pen.

   Massimo's finger was poised above red on his multi-coloured biro like a kangaroo frozen in headlights.

   2007, Karen Foxlee, The Anatomy of Wings, page 250

3. broadlyuncountableInk from a ballpoint pen.

   ‘My very creative 2-year-old son used my good friend′s white polyester Roman blinds as a canvas,’ says Jacqui. They′re now covered in blue biro. And although my friend isn′t too bothered by the biro, I am! Can you help?′

   2011, Shannon Lush, Jennifer Fleming, Completely Spotless, unnumbered page

plural Biros

1. A surname from the Slavic languages.
2. A brand of ballpoint pen: see biro.