'Tusche' definitions:

Definition of 'Tusche'

From: GCIDE

Tusche \Tusch"e\, n. Also Tushe \Tushe\, Tousche \Tousche\, etc. [G. tusche, fr. F. toucher to touch.] 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. [Webster 1913 Suppl.]