inkball

Etymology

From ink + ball.

inkball means the gall of an oak tree, used to produce ink. Lexicurio rates it Sui generis — a strength score of 91 out of 100.

noun

The gall of an oak tree, used to produce ink.“The first tree I knew was an oak under which I played as a small child and gathered large inkballs that I used as marbles.”
A leather-covered dauber, stuffed with soft, resilient wadding, with a wooden handle, used to ink type forms for printing. A predecessor of brayers and self-inking presses.“[…]consider that this perfect work was done on a wooden press, that the form was inked by hand with inkballs or "daubers,"[…]”