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Biro (n.)

proprietary name of a type of ball-point pen, 1947, from László Bíró, the Hungarian inventor. The surname means "judge."

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Definitions of Biro from WordNet

Biro (n.)
a pen that has a small metal ball as the point of transfer of ink to paper;
Synonyms: ballpoint / ballpoint pen / ballpen
From wordnet.princeton.edu