Adjective
orientable (not comparable)
(topology) Able to be oriented.
An orientable manifold has infinitely many volume forms, since multiplying a volume form by a non-vanishing function yields another volume form. Source: Internet
Some non-convex orientable polyhedra have regions turned "inside out" so that both colours appear on the outside in different places. Source: Internet
Alternatively, for an orientable surface the formula can be given in terms of the genus of a surface, g: :: (Weisstein). Source: Internet
Classification of closed surfaces Some examples of orientable closed surfaces (left) and surfaces with boundary (right). Source: Internet
Every closed orientable surface admits a complex structure. Source: Internet
In general, a surface is said to be orientable if it does not contain a homeomorphic copy of the Möbius strip; intuitively, it has two distinct "sides". Source: Internet