bottom dead center

/B AA1 T AH0 M D EH0 D S EH0 N T ER0/

noun

1
(mechanical) A position in the cycle of a piston engine wherein the piston is at the bottommost point in its stroke. In a four-stroke cycle, BDC occurs twice: at the end of the intake stroke and at the end of the power stroke.
2
(mechanical) The reference mark on a flywheel (and engine block) indicating that the engine is in this position, when aligned.

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