| CY | Eurasian subspecies of tundra swan |
|---|---|
| CY | North American subspecies of tundra swan having a soft whistling note |
| CY | common Old World swan noted for its whooping call |
| CY | soundless Eurasian swan |
| CY | a cylindrical container for oxygen or compressed air |
| CY | a chamber within which piston moves |
| CY | a solid bounded by a cylindrical surface and two parallel planes (the bases) |
| CY | a surface generated by rotating a parallel line around a fixed line |
| CY | a metal casting containing the cylinders and cooling ducts of an engine |
| CY | a detachable plate that covers the closed end of a cylinder chamber in a reciprocating engine or pump |
| CY | a lock in which a cylinder rotates to move bolt |
| CY | a printing press where the type is carried on a flat bed under a cylinder that holds paper and rolls over the type |