As the title says, I'm looking for a word that means "having horizontal and vertical directions."
The catch is that I'm a mathematician trying to describe notions similar to "horizontality" and "verticality" to other mathematicians, so there is an extra criterion: the word should not have a common specifically mathematical meaning. For example, "planar" and "orthogonal" might be passible when talking to non-mathematicians, but their use when talking to a mathematician would probably cause confusion.
Edit: to reiterate, the word should not have an existing common mathematical meaning.