Heccagium
Defined in 2 dictionaries — Bouvier (1914), Black's (1910)
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
Rent'pald to the lord for liberty to use engines called hecks. Toml.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In feudal law. Rent paid to a lord of the fee for a liberty to use the engines called "hecks."