nonorientable

== English == === Alternative forms === non-orientable === Etymology === From non- +‎ orientable. === Adjective === nonorientable (not comparable) (topology) 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