bargeboard
Concise Oxford English Dictionary © 2008 Oxford University Press:
bargeboard/ˈbɑːʤbɔːd/
▶noun an ornamental board fixed to the gable end of a roof to hide the ends of the roof timbers.
– origin C19: from barge- (used in terms relating to a gable), perh. from med. L. bargus ‘gallows’.
'bargeboard' also found in these Oxford entries:

