- cylinder - a cylindrical container for oxygen or compressed air
--1 is a kind of container
--1 is a part of aqualung, Aqua-Lung, scuba- cylinder - a solid bounded by a cylindrical surface and two parallel planes (the bases)
--2 is a kind of solid
--2 has particulars: roll; roller- cylinder - a surface generated by rotating a parallel line around a fixed line
--3 is a kind of round shape
--3 has particulars:brake drum, drum; shank; shank; shank, stem; stalactite; stalagmite; barrel, drum; pipe, tube - cylinder, piston chamber - a chamber within which piston moves
--4 is a kind of chamber
--4 is a part of engine block, cylinder block, block; pump; compressor
--4 has parts: intake valve
--4 has particulars: brake cylinder, hydraulic brake cylinder, master cylinder - cylinder - a solid bounded by a cylindrical surface and two parallel planes (the bases)