from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A black liquid used for drawing in lithography and as a resist in etching and silk-screen work.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A black liquid used in lithography for drawing and painting and in etching and the silk-screen process as a resist.
from the GNU version of the Collaborative International Dictionary of English
- A lithographic drawing or painting material of the same nature as lithographic ink. It is also used as a resistant in the biting-in process.
German, back-formation from tuschen, to lay on colors, from French toucher, from Old French tochier, touchier, to touch; see touch.(American Heritage® Dictionary of the English Language, Fourth Edition)
From German tuschen, from French toucher, from Old French tuchier (Wiktionary)