Definitions of scull:

• noun:   a racing shell propelled by one or two oarsmen pulling two oars
• noun:   one of a pair of short-handled oars
• noun:   a long-handled oar mounted at the stern of a boat and moved left and right to propel the boat forward
• verb:   propel with sculls

  Example: "Scull the boat"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #9285)