Lacus
Defined in 3 dictionaries — Ballentine's (1916), Bouvier (1914), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
A lake; an alloy of silver.
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
In Old English Law. An alloy of silver with base metal. Fleta 1. 22, § 6. In Civil Law. A lake, a receptacle for water which is never allowed to get dry. Dig. 43, 14, 1, 3.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In the civil law. A lake; a receptacle of water which is never dry. Dig. 48, 14, 1, 3.
In old English law. Allay or alloy of silver with base metal. Fleta, lib. 1, c. 22, § 6.