Scavenging Scav"eng*ing, p. pr. & vb. n. of {Scavenge}. Hence, n. (Internal-combustion Engines) Act or process of expelling the exhaust gases from the cylinder by some special means, as, in many four-cycle engines, by utilizing the momentum of the exhaust gases in a long exhaust pipe. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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