- (aviation, nautical) The disturbed mass of air or water pushed aft (or fore when in reverse) by the propeller of an aircraft or propeller-driven watercraft.
- Byproduct of thrust produced by a propeller.
- (aviation, nautical, humorous) In military or other social organizations involving aircraft or boats, a mythical substance supposedly used to wash propellers.
- We sent the new recruit to obtain a bucket of prop wash.
mass pushed by propeller