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Meaning of double overhead camshaft

dou'ble o'verhead cam'shaft

Pronunciation: [key]
— Auto. Auto.
  1. a pair of overhead camshafts, one to operate the intake valves and the other to operate the exhaust valves. Abbr.: DOHC
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.