nonorientable

Alternative forms

 * non-orientable

Adjective

 * 1)  Not able to be oriented.
 * The Möbius strip is a nonorientable surface.
 * Through every point of a nonorientable surface there passes a Möbius-like nonorientable strip (with an odd number of half-twists) which is part of that surface.

Antonyms

 * orientable