bottom dead center

bottom dead center

[′bäd·əm ‚ded ′sen·tər] (mechanical engineering) The position of the crank of a vertical reciprocating engine, compressor, or pump when the piston is at the end of its downstroke. Abbreviated BDC.

bottom dead center (BDC)

The position of the piston within a cylinder of a reciprocating engine when it has reached its position farthest from the cylinder head.