From Longman Dictionary of Contemporary Englishbirobi‧ro /ˈbaɪərəʊ $ ˈbaɪroʊ/ noun (plural biros) [countable] trademark British English DTa pen with a small ball at the end that puts ink onto paper SYN ball point → pen1
Examples from the Corpus
biro• Viol pulled out a notebook and a biro.• His fingers were tobacco-stained as he fiddled with a biro.• Start banging on the ceiling every time he took out his biro?• I move again and try to write some notes, but it is cold enough to freeze the ballpoint off my biro.• Sam knocked over his jar of biros on his desk, gathered them up and dropped his notebook.• Bring a red biro and a see-through bag for your map.• I can hardly hold this biro.• A forty quid software voucher awaits the sender of the best letter - so whip out yer biros and get scribbling!Origin biro (1900-2000) László Biró (1899-1985), the pen's Hungarian inventor 