scull
Concise Oxford English Dictionary © 2008 Oxford University Press:
scull/skʌl/
▶noun each of a pair of small oars used by a single rower.
■ an oar placed over the stern of a boat to propel it with a side to side motion.
■ a light, narrow boat propelled with a scull or a pair of sculls.
■ (sculls) a race between boats in which each participant uses a pair of oars.
▶verb propel a boat with sculls.– derivatives
sculler noun,
sculling noun.
sculler noun,
sculling noun.
– origin ME: of unknown origin.
'scull' also found in these Oxford entries:

