Generally, refers to the bottle or vial from which you fill a fountain pen. Specifically, refers to decorative containers especially designed to hold writing ink, particularly for use with dip pens. The collection of such inkwells has become a thriving enterprise unto itself.
Inkwell, or simply Ink, is the name of the handwriting recognition technology built into Apple Computer's Mac OS X. It was introduced in version 10.2, Jaguar. Inkwell can translate English, French, and German writing.