biro

1. (by extension, UK, Commonwealth, Ireland) Any ballpoint pen.Examples: "Massimo's finger was poised above red on his multi-coloured biro like a kangaroo frozen in headlights."CommonwealthIrelandUKbroadlycountableuncountable

2. (uncountable, by extension) Ink from a ballpoint pen.Examples: "‘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?′"broadlyuncountable