A cylinder is a geometric solid that is very common in everyday life, such as a soup can. If you take it apart you find it has two ends, called bases, that are usually circular. The bases are always congruent and parallel to each other. ... (See Surface area of a cylinder).
A cylinder is a three-dimensional shape in geometry. A cylinder is round and has a top and bottom in the shape of a circle. The top and the bottom are flat and always the same size.
A cylinder has 1 side which wraps around circular areas in the two ends. If the ends are enclosed then there are 2 circular sides for a total of 3 sides, two of which are flat circles and one curved side.
A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work.