ballpoint
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1.
A pen having as its writing point a small ball bearing that transfers ink stored in a cartridge onto a writing surface.
from The American Heritage® Dictionary of the English Language, 4th Edition
1.
a pen which has a small metal ball as point of transfer of ink to paper, at the tip of a cylandrical and non-refillable reservoir of ink; -- short for ballpoint pen.
from the GNU version of the Collaborative International Dictionary of English