[f. LOCK sb.2 + -FUL.] As much as will fill a lock.
1811. Two Rep. Thames Navig., 25. The Canals, some of which have no water, pay heavily for every lockfull forced up by steam-engines.
1837. Civil Eng. & Archit. Jrnl., I. 44/2. Making 6740 cubic feet or 46,2433/4 gallons of water to each lockful.
