narrowboat
Concise Oxford English Dictionary © 2008 Oxford University Press:
narrowboat/ˈnarəʊbəʊt/
▶noun Brit. a canal boat less than 7 ft (2.1 m) wide with a maximum length of 70 ft (21.3 m) and steered with a tiller rather than a wheel.
'narrowboat' also found in these Oxford entries:

