noun
: a draftsman's pen for ruling lines that has a pair of adjustable metal blades or points between which the ink is contained with the thickness of the line being regulated by a screw that closes the blades or allows them to open
noun
: a draftsman's pen for ruling lines that has a pair of adjustable metal blades or points between which the ink is contained with the thickness of the line being regulated by a screw that closes the blades or allows them to open
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012