A cup or reservoir for ink in use, fitted into the top of a desk, an inkstand, or other convenient receptacle; the containing part of an inkstand, as distinguished from the frame.(noun)
The Century Dictionary (Public Domain)
Use "ink-well" in a sentence
"I inhale chalk smell and idle tug the dove-print pill from the desk's ink-well."
"Jane, that ink-well image hits home — you amaze me by coming up with such vivid & compelling stuff"
"It had ink-well hollows, I thought that was so cool."