disconformity
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a crescent
Not normally on its surface.
A cylinder has two parallel, usually circular bases connected by a curved surface.
In Euclidian geometry, which is the geometry of a plane surface, parallel lines do not intersect because that is the definition of parallel lines. But note that there are other geometrical systems in which parallel lines do intersect, for example if they are drawn on the surface of a sphere. Definition of parallel lines: Lines that always stay the same distance apart and never meet.
a cylinder is basically a solid bounded by a cylindrical surface and two parallel planes (the bases) or a surface generated by rotating a parallel line around a fixed line