instrumentation (a piece of equipment or tool) used to effect an end

flat surface that rotates and pushes against air or water

a short light oar used without an oarlock to propel a canoe or small boat

each of a pair of short oars that are used by a single oarsman

a long oar that is mounted at the stern of a boat and moved left and right to propel the boat forward

a long oar used in an open boat

an oversized oar or board to control the direction of a ship or other watercraft prior to the invention of the rudder.

flat surface that rotates and pushes against air or water