One option would be hemidisc.
cylinder??nope
A shape with three linear sides and one curved side can be drawn, but such a shape has no specific name.
An ellipse is the proper name for an oval shape, however, a circle is a closed curved shape similar to an oval shape.
There is no specific name for such a shape.
sphere
A two-dimensional shape with one curved side and four straight sides can be created, but there is not specific name for such a shape.
A semicircle is one shape fitting this description.
A quadrilateral is a shape with four straight sides. There are no curved sides in a quadrilateral.
There is not a name becasue there are many different shapes. A sphere, an ellipsoid, a torus (doughnut), toroidal shapes with two or more "holes", a paraboloid, semi-hyperboloid etc are all 3-dimensional shapes which have got just one curved surface.
Such a shape probably does not have a specific name.
The term comes from the Greek word meaning "curved rod" referring to the bacteria's curved shape.
Maybe it is Curvilinear rectangle