Wiktionary
zero-dimensional
a. (context geometry English) Of geometrical objects, having zero dimensions; having no extent in any direction
Usage examples of "zero-dimensional".
And second, having made the bold leap in the 1970s and early 1980s from zero-dimensional point particles to one-dimensional strings, and having now seen that string theory actually involves two-dimensional membranes, might it be that there are even higher-dimensional ingredients in the theory as well?
The nanoscopic, zero-dimensional equivalent is a quantum dot, capable of trapping electrons in pseudoatomic orbitals.