The bitter fluid secreted by the liver of the ox.(noun)
The Century Dictionary (Public Domain)
Use "ox-gall" in a sentence
"Each color, which must be ground very fine, is mixed in water and ox-gall, and sprinkled separately over the surface of the gum with brushes."
"The ox-gall prevents the colors from mixing together on the solution, every drop being distinct."
"When ink is to be used on parchment, or glossy tracing-paper, it will flow perfectly if a few drops of ox-gall be mixed with it; but on soft paper, or on bristol board, this will cause the ink to spread."