'Scavenging' definitions:

Definition of 'Scavenging'

From: GCIDE
  • 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.]