Aqua-Lung, aqualung, scuba - a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus

container - any object that can be used to hold things (especially a large metal boxlike object of standardized dimensions that can be loaded from one form of transport to another)

roll - anything rolled up in cylindrical form

roller - a cylinder that revolves

solid - a three-dimensional shape

brake drum, drum - a hollow cast-iron cylinder attached to the wheel that forms part of the brakes

shank - cylinder forming the part of a bit by which it is held in the drill

shank - cylinder forming the part of a bolt between the thread and the head

shank, stem - cylinder forming a long narrow part of something

stalactite - a cylinder of calcium carbonate hanging from the roof of a limestone cave

stalagmite - a cylinder of calcium carbonate projecting upward from the floor of a limestone cave

round shape - a shape that is curved and without sharp angles

barrel, drum - a bulging cylindrical shape; hollow with flat ends

pipe, tube - a hollow cylindrical shape

brake cylinder, hydraulic brake cylinder, master cylinder - a cylinder that contains brake fluid that is compressed by a piston

chamber - a natural or artificial enclosed space

compressor - a mechanical device that compresses gasses

cylinder block, engine block, block - a metal casting containing the cylinders and cooling ducts of an engine; "the engine had to be replaced because the block was cracked"

intake valve - a valve that controls the flow of fluid through an intake

pump - a mechanical device that moves fluid or gas by pressure or suction