Definition of ruling pen
: 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
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up ruling pen? Please tell us where you read or heard it (including the quote, if possible).