scull (Noun) — A long oar that is mounted at the stern of a boat and moved left and right to propel the boat forward.
scull (Noun) — Each of a pair of short oars that are used by a single oarsman.
scull (Noun) — A racing shell that is propelled by sculls.
scull (Verb) — (sport) propel with sculls. ex. "scull the boat"