What do a.m. and p.m. stand for?

power chain

an endless chain for transmitting motion and power between sprockets on shafts with parallel axes.
Also called pitch chain.
Compare roller chain. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for power chain
  • The other divisions made power chain saws and outboard motors.
  • Praetors were one step below consuls in the power chain and handled judicial matters.

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